Monitor USB Ports Not Working With HDMI? (August 2026) Fix Guide

You plug in your new monitor with an HDMI cable, spot those handy USB ports on the side, and connect your keyboard only to find nothing happens. If this sounds familiar, you are far from alone. Thousands of users run into this exact scenario every month, searching for answers when their monitor USB ports not working with HDMI connections leave them puzzled.

The reason is straightforward once you understand it: HDMI only carries video and audio signals. It has no capacity to transmit USB data whatsoever. Your monitor essentially houses two separate devices inside one chassis — a display panel and a USB hub — and each one requires its own dedicated connection to function.

This guide walks through everything you need to know about getting those USB ports active, from the basic upstream cable setup to advanced troubleshooting for Windows 11 and macOS systems. Whether you are using a Dell, LG, Samsung, or BenQ display, you will find the fix here.

Quick Fix: Why Your Monitor USB Ports Are Not Working

Your monitor USB ports are not working because HDMI only transmits video and audio. To activate the USB hub built into your monitor, you need to connect a separate USB-B to USB-A cable (or USB-C cable) from the monitor’s upstream port to your computer. This additional cable creates the data pathway that allows the monitor’s USB ports to communicate with your system.

Key Takeaways

• HDMI carries only video and audio — USB data requires a completely separate physical connection
• A USB-B to USB-A cable (often included with your monitor) links the monitor’s built-in hub to your computer
• USB-C monitors with DisplayPort Alt Mode can handle video and USB data through one cable
• Once the upstream connection is made, downstream USB ports work just like those on your computer
• Windows power management settings and outdated firmware are the most common causes of ongoing issues

What Are USB Ports on a Monitor For?

Many monitors come equipped with USB ports that function as a built-in hub, giving you convenient front-facing or side-facing access for your peripherals. Instead of reaching behind your computer tower or fumbling with a laptop’s limited ports, you simply plug devices directly into the display sitting right in front of you.

These downstream USB-A ports on your monitor behave almost identically to the ones on your PC. You can connect keyboards, mice, webcams, flash drives, external storage, smartphone charging cables, and virtually any other USB peripheral you would normally attach to your computer.

The real advantage surfaces when your desktop lives under a desk or in an awkward location. Having accessible ports at arm’s length means no more crawling around on the floor whenever you need to plug in a thumb drive or swap a mouse. For laptop users, a monitor’s USB hub can effectively replace a standalone docking station when paired with the right connections.

Why Don’t Monitor USB Ports Work with HDMI Alone?

HDMI was designed exclusively for high-definition multimedia — video and audio signals routed between a source device and a display. The specification has never included provisions for transmitting USB data. This is not a limitation of your particular monitor; it is a fundamental characteristic of the HDMI standard itself.

Think of your monitor as two separate devices sharing the same housing. The display panel receives its signal through HDMI or DisplayPort. The USB hub, on the other hand, needs its own data path back to the host computer. These two systems operate independently, which is why your screen can look perfect while the USB ports sit completely unresponsive.

When users discover this for the first time, the confusion is understandable. Most people reasonably assume that connecting a single cable to their monitor activates everything. But just as a printer needs both a power cord and a data cable, your monitor requires both a display connection and a USB connection to unlock all its features.

If you are also dealing with display issues beyond USB ports, check out our guide on fixing the PC monitor no signal error for additional troubleshooting steps.

How to Activate USB Ports on Your Monitor

Activating the USB hub on your monitor comes down to making one additional physical connection. The process takes less than two minutes once you have the right cable in hand.

What You Will Need

• Your monitor with built-in USB ports
• An HDMI or DisplayPort cable already connected for video
• A USB-B to USB-A cable (usually shipped in the monitor’s box)
• Your desktop or laptop computer

Step-by-Step Instructions

1. Find the upstream port on your monitor. Look on the back panel for a square-shaped USB-B port, frequently labeled “USB Upstream,” “USB-B IN,” or simply marked with a square icon. This port is physically different from the rectangular downstream USB-A ports on the side or bottom edge.
2. Connect the USB-B end to the monitor. Insert the square connector into the upstream port. It should fit snugly with moderate resistance. Never force it — the plug only inserts one way.
3. Connect the USB-A end to your computer. Plug the rectangular end into any available USB-A port on your computer. For best results, use a port on the rear I/O panel of a desktop motherboard rather than front-panel headers, which sometimes deliver inconsistent power.
4. Wait for automatic recognition. Windows, macOS, and Linux all support USB hubs natively. Your operating system should detect the monitor’s hub within a few seconds and install generic drivers automatically.
5. Test the downstream ports. Plug a USB device — a mouse, keyboard, or flash drive — into one of the monitor’s USB-A ports. If it works, you are all set.

If the ports do not respond immediately, try restarting your computer with the upstream cable connected. A fresh boot gives the operating system a clean opportunity to enumerate the hub and assign proper drivers.

What Is a USB Upstream Port on a Monitor?

The upstream port is the single most important connector for getting your monitor’s USB hub working. Without it, the downstream ports have no path back to your computer and remain inactive.

On most monitors, the upstream port uses the USB-B form factor — that distinctive square connector with beveled corners on two sides. This shape is deliberate: it prevents anyone from accidentally plugging two computers together or using the wrong cable type. Downstream ports, by contrast, use standard rectangular USB-A connectors that accept your everyday peripherals.

A useful analogy is to think of the upstream port as the on-ramp to a highway. Traffic (data) flows from your computer through this port, enters the monitor’s internal USB hub, and then gets distributed to the downstream ports where your devices are connected. Without that on-ramp, the entire highway sits empty.

Most manufacturers place the upstream port on the back of the monitor alongside the display inputs. On USB 3.0-equipped monitors, this port is typically blue. On USB 2.0 models, it may be black or white. Some newer displays replace the USB-B port with a USB-C port that can serve the same upstream function while also carrying video and power.

How to Connect Your Monitor Using USB Port

The exact connection method depends on whether your monitor uses a traditional USB-B upstream port or a modern USB-C port. Both approaches achieve the same result but differ in cable requirements and capabilities.

For Most Monitors (USB-B Connection)

1. Identify your cables. You should have an HDMI or DisplayPort cable for video and a separate USB-B to USB-A cable for the hub.
2. Connect the display cable first. Run HDMI or DisplayPort from your monitor to the corresponding output on your GPU or motherboard.
3. Locate the USB-B upstream port. Check the back of your monitor for the square connector mentioned earlier.
4. Attach the USB-B end to the monitor. Plug the square connector firmly into the upstream port.
5. Attach the USB-A end to your computer. Use a rear motherboard port for the most reliable connection.
6. Power on in sequence. Turn the monitor on first, then boot your computer. This order helps the OS detect the hub during startup.

When I first set up a Dell monitor at my workstation, I spent twenty minutes convinced the USB ports were defective. After digging through the documentation, I found the small USB-B port tucked between the DisplayPort and power connector. Connecting the included upstream cable instantly brought all four USB-A ports to life for my keyboard, mouse, and webcam.

For USB-C Monitors

Modern USB-C monitors simplify everything by combining video, data, and sometimes power into a single cable. If both your monitor and computer support USB-C with DisplayPort Alt Mode, one cable handles the display signal and USB hub data simultaneously.

1. Verify USB-C video support on both ends. Not every USB-C port supports video output. Look for a DisplayPort (D-shaped) icon or Thunderbolt bolt icon next to the port. A port with only a battery or USB SuperSpeed icon handles data and charging but not display.
2. Use a quality USB-C cable rated for video. Cheap charge-only cables lack the wiring to carry display signals. Cables certified for USB 3.2 Gen 2 or Thunderbolt 3/4 are safe bets.
3. Connect directly between monitor and computer. Avoid daisy-chaining through adapters or intermediate docks, which can introduce compatibility problems.
4. Confirm both video and USB ports function. Test a peripheral in the monitor’s USB port and verify the display is active.

If you are using adapter-based connections and running into problems, our guide on fixing a VGA to HDMI adapter not working covers similar diagnostic principles that apply to USB-C adapters as well.

How to Use Monitor USB Ports for Mouse and Keyboard

Plugging your input devices into the monitor is one of the most practical reasons to get that USB hub working. Once the upstream connection is established, connecting a mouse and keyboard is as simple as inserting them into any available downstream USB-A port on the monitor.

Benefits of Running Peripherals Through Your Monitor

• Less cable clutter. Peripherals connect at your monitor rather than routing cables across or under your desk to the PC.
• Convenient access. Front or side-mounted ports make it easy to swap devices without reaching behind your tower.
• Hot-swappable convenience. Plug and unplug devices freely without restarting — USB hubs support hot-swapping natively.
• Cleaner desk setup. A single upstream cable runs from the monitor to the PC, while peripherals connect locally at the display.

Setup Process

1. Complete the USB hub activation by connecting the upstream cable as described above.
2. Plug in your keyboard to any downstream USB-A port on the monitor.
3. Connect your mouse to another downstream port.
4. Wait for detection. The operating system should recognize both devices within a few seconds.
5. Test everything. Type a few characters and move the mouse to confirm full functionality.

Peripheral Troubleshooting Checklist

• Try a different downstream port on the monitor — individual ports can fail independently.
• Test the device directly on your computer to rule out a faulty peripheral.
• Check that the upstream cable has not loosened at either end.
• Restart the computer with all cables connected and devices attached.
• For gaming peripherals specifically, try connecting directly to the PC if you notice any input lag. Monitor USB hubs add an extra hop that can introduce milliseconds of delay — imperceptible for everyday use but potentially relevant in competitive gaming.

USB-B vs USB-C Monitor Connections

Understanding the difference between USB-B and USB-C upstream connections helps you choose the right cable and set realistic expectations for what each connection type can do.

USB-B upstream connections are the traditional standard found on most monitors manufactured before 2023. They require a dedicated USB-B to USB-A cable that runs alongside your HDMI or DisplayPort cable. The upstream cable handles only USB data — it carries no video and provides no power to the monitor.

USB-C upstream connections are increasingly common on newer displays. When both the monitor and computer support DisplayPort Alt Mode over USB-C, a single USB-C cable can carry video, USB data, and up to 100W of power delivery. This is the cleanest possible setup: one cable replaces the HDMI cable, the USB upstream cable, and sometimes even the laptop’s charging brick.

The trade-off is compatibility. USB-C only delivers this all-in-one experience when every link in the chain supports the right protocols. A USB-C port that only handles data and charging will not send video to your monitor, even with a premium cable. Always check for the DisplayPort or Thunderbolt icon next to the port before assuming video support.

How to Check if Your USB-C Port Supports Video Output

Not all USB-C ports are created equal. Some handle video, data, and power. Others manage only data and charging. Identifying which type you have prevents hours of frustration when a USB-C to HDMI adapter or direct USB-C monitor connection fails to produce a display.

Look for icons printed next to the port on your laptop or desktop. A small DisplayPort logo (a D-shaped symbol with pins) indicates DisplayPort Alt Mode support, which means the port can output video. A Thunderbolt bolt icon means Thunderbolt 3, 4, or 5, all of which carry video natively. A plain USB icon or battery icon means the port handles data and charging only.

On Windows machines, you can also check by opening Device Manager and expanding the “Display adapters” section. If a USB-C display adapter or Thunderbolt controller appears, your port supports video. On Mac, all USB-C and Thunderbolt ports manufactured since 2017 support external displays.

If your computer lacks a USB-C port with video support, you can still use the monitor’s USB hub by connecting a standard USB-B to USB-A cable for data while running a separate HDMI cable for video. The two connections work side by side without interfering with each other.

Common Issues and Troubleshooting

Even after connecting the upstream cable properly, problems can arise. This section covers the most frequently reported issues drawn from manufacturer support forums, community discussions on Reddit, and our own testing experience.

USB Ports Not Working at All

If the upstream cable is connected but no downstream ports respond, start with the basics. Confirm the cable seats firmly at both ends — a slightly loose USB-B connector is easy to overlook since the port is usually hidden on the back panel. Try a different USB-A port on your computer, preferably one directly on the motherboard’s rear I/O rather than a front-panel header or USB hub.

If that does not help, open Device Manager in Windows and look under “Universal Serial Bus controllers” for any entries showing a yellow warning icon. An unknown device or a “BillBoard Service” entry in this section typically means the monitor’s USB hub failed to enumerate properly, which can stem from a driver conflict or a bad cable.

Testing the monitor on a different computer is one of the most reliable diagnostic steps. If the USB ports work on another machine, the problem lies with your computer’s USB controller, drivers, or power management settings. If they fail on a second machine as well, the monitor’s internal hub may have a hardware fault that requires warranty service or replacement.

USB Root Hub Power Management (Windows 10 and 11)

Windows has a feature called USB selective suspend that powers down USB ports to save energy. While well-intentioned, this setting frequently disables monitor USB hubs after periods of inactivity and fails to bring them back online when needed.

Here is how to disable it:

1. Press Windows + X and select Device Manager.
2. Expand the Universal Serial Bus controllers section.
3. Right-click each USB Root Hub entry and select Properties.
4. Go to the Power Management tab.
5. Uncheck “Allow the computer to turn off this device to save power.”
6. Click OK and repeat for every USB Root Hub listed.

After making this change, restart your computer. This fix resolves a large share of cases where monitor USB ports refuse to work or stop functioning after the computer has been idle.

You can also disable USB selective suspend system-wide by going to Settings > System > Power and battery > Power mode, then clicking “Change advanced power settings” and navigating to USB settings > USB selective suspend setting and setting it to Disabled.

Devices Disconnect Randomly

Intermittent disconnections usually trace back to cable quality or power limitations. Longer USB cables attenuate the signal, especially at USB 3.0 speeds. If your upstream cable is longer than six feet, try swapping it for a shorter one. Avoid using USB extension cables or adapters in the upstream path, as each additional connector introduces resistance and signal degradation.

Power-related drops happen when too many devices draw current simultaneously from the monitor’s hub. The hub has a fixed power budget shared across all downstream ports. An external hard drive, a charging phone, and a bus-powered webcam together can exceed what the monitor supplies. Disconnect power-hungry peripherals one at a time to identify the overload.

Only Some Ports Work

Monitors sometimes mix USB 2.0 and USB 3.0 downstream ports. Check your monitor’s specifications or manual to identify which ports are which. USB 2.0 ports (typically black inside) deliver up to 500mA and run at Hi-Speed rates. USB 3.0 ports (usually blue inside) supply up to 900mA at SuperSpeed. Plugging a USB 3.0 external drive into a USB 2.0 port may work but will transfer data much more slowly and could brown out under heavy load.

If ports of the same type behave differently, test each one with the same device. A completely dead port could indicate physical damage to the internal connector or a solder joint failure on the monitor’s circuit board.

Monitor USB Ports Do Not Work After Sleep

This is one of the most widely reported complaints across Reddit threads and manufacturer forums. After a Windows PC wakes from sleep or hibernation, the monitor’s display comes back but the USB hub remains unresponsive. The root cause is almost always USB selective suspend or the monitor’s power-saving mode cutting power to the hub during sleep.

Apply the USB Root Hub power management fix described above. Additionally, unplug and replug the upstream cable to force a fresh enumeration. For a more permanent solution, turn off power saving mode on your monitor through its on-screen display menu.

If your USB ports stop working after your computer wakes from sleep, you should also check our guide on fixing external monitors not waking from sleep for related fixes that address both display and USB recovery issues together.

USB-C to HDMI Adapter Not Working

A separate but related issue affects users who connect their monitor through a USB-C to HDMI adapter or dongle. When the adapter stops sending video to the monitor, the problem is distinct from a monitor’s built-in USB hub failing — it lives in the adapter or the source computer’s USB-C port.

First, verify the USB-C port on your computer supports DisplayPort Alt Mode (see the section above on checking port capabilities). Many laptops ship with a mix of video-capable and charging-only USB-C ports, and confusing the two is an easy mistake.

Second, test the adapter with a different monitor and cable. Adapters are the weakest link in the chain and fail more often than monitors or cables. Windows Update can also break USB-C display drivers — if problems started immediately after a system update, roll back the graphics driver or the USB-C controller driver through Device Manager. On Windows 11 specifically, navigate to Settings > Windows Update > Update history > Uninstall updates to remove the problematic update.

Brand-Specific Troubleshooting Notes

Dell monitors frequently resolve USB hub issues through the Dell Display Manager application, which includes firmware update functionality. Download it from Dell’s support site using your monitor’s service tag. Dell’s official troubleshooting guide also recommends disconnecting all USB devices from the monitor, power cycling both the monitor and computer, then reconnecting devices one at a time.

LG monitors, particularly models like the 27UK850-W and the UltraFine series, have a known issue where the USB hub becomes unresponsive after macOS updates. On Mac, open System Settings > Displays and check that the monitor appears correctly. Resetting the Mac’s NVRAM/PRAM (hold Option-Command-P-R during startup on Intel Macs) can restore USB-C communication. Apple Silicon Macs handle this automatically during boot.

Samsung monitors with USB hubs sometimes require the Easy Setting Box utility for full hub functionality on Windows. BenQ monitors benefit from checking for firmware updates through BenQ’s website, as several models received patches addressing USB hub stability after initial release.

Monitor Firmware Updates

Monitor firmware receives far less attention than GPU drivers or Windows updates, but it can directly affect USB hub behavior. Firmware bugs can cause the hub to drop devices, fail enumeration, or stop responding after power cycling.

Check your manufacturer’s support page by searching your exact model number. Dell, LG, Samsung, BenQ, and HP all occasionally release firmware updates that address USB hub issues. The update process varies by brand — some require a USB flash drive plugged into the monitor, others use a companion application on your computer.

Always read the release notes before applying a firmware update. If the notes do not mention USB fixes, the update is unlikely to help and carries a small risk of introducing new problems. Never disconnect power during a firmware flash, as this can permanently brick the monitor.

How to Use USB Ports on Monitor with Laptop

Laptop users stand to gain the most from a monitor’s built-in USB hub. With limited ports on the laptop itself and a monitor already sitting on the desk, using the display as a peripheral hub makes the whole setup function like a docking station without extra hardware.

Laptop-Specific Advantages

• Preserves laptop ports. Free up your laptop’s scarce USB-C and USB-A ports for other peripherals or charging.
• Single-cable docking. USB-C monitors with power delivery charge your laptop and carry USB data through one connection.
• Instant dock-and-undock. Unplug one cable to grab your laptop and go. Reconnect to restore your full desktop setup.
• No extra hardware needed. Skip buying a separate USB-C hub or docking station if your monitor already has enough ports.

Setup Process for Laptops

1. Connect HDMI or DisplayPort from the monitor to your laptop’s video output.
2. Connect the USB upstream cable from the monitor to an available USB-A port on your laptop. If your laptop lacks USB-A, use a USB-C to USB-A adapter.
3. For USB-C monitors with Alt Mode: A single USB-C cable between the monitor and laptop can carry video, USB hub data, and power delivery simultaneously.
4. Configure display settings in your OS to extend or mirror as preferred.

USB-C and Thunderbolt Laptop Considerations

Many current laptops have transitioned entirely to USB-C and Thunderbolt ports, leaving no USB-A ports for the traditional upstream cable. In this situation, you have two options: use a USB-C to USB-A adapter for the upstream cable, or upgrade to a USB-C monitor that handles everything through one connection.

Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 ports are fully compatible with USB-C monitors and deliver the highest bandwidth available. A Thunderbolt-connected monitor can handle multiple high-resolution displays, full USB 3.x speeds for all downstream ports, and power delivery up to 100W — all through one cable.

If you are building out a multi-monitor workstation, check our guide on how to connect two monitors with one HDMI port for additional setup strategies.

Connection Sequence Best Practices

The order in which you plug cables in can sometimes determine whether everything works on the first try. While USB is designed to be hot-swappable, following a consistent connection sequence reduces the chance of enumeration failures and unrecognized devices.

Recommended order: Connect the display cable (HDMI or DisplayPort) first. Then connect the USB upstream cable. Finally, power on the monitor before booting the computer. This sequence gives the monitor’s USB hub time to initialize before the operating system starts scanning for devices.

When adding peripherals to the monitor’s downstream ports, plug them in after the hub is recognized by the OS. Connecting everything at once during boot occasionally causes the hub to run out of endpoints, leading to one or more devices not being detected. Staggering connections by a few seconds between each device avoids this entirely.

Frequently Asked Questions

Conclusion

Getting your monitor USB ports working alongside an HDMI connection comes down to one essential fact: HDMI and USB are completely separate systems sharing the same monitor housing. The HDMI cable drives your display. A USB-B to USB-A upstream cable (or a USB-C cable with Alt Mode) activates the built-in hub. Once both connections are in place, the downstream USB ports on your monitor work just like any other ports on your computer.

Most problems that arise after initial setup trace back to USB selective suspend in Windows power management, a loose upstream cable, or outdated monitor firmware. Walking through the troubleshooting steps in this guide — especially the USB Root Hub power management fix — resolves the majority of reported issues.

Whether you are setting up a desktop workstation or creating a single-cable laptop docking solution, your monitor’s USB hub is a genuinely useful feature once you understand how to activate it. Grab the upstream cable from your monitor’s box, make the connection, and enjoy having USB ports right where you need them.