USB Hub Not Working? Here’s How to Fix Common Issues

Published July 19, 2026 · Reviewed by the Unbiased Advice & Insights editorial team · How we research and score

Why USB Hubs Fail: Common Causes

USB hubs are convenient but can be finicky. Our editorial team compared specifications, buyer feedback and key decision factors to identify the most frequent problems: insufficient power, driver conflicts, cable defects, and bandwidth limitations. Understanding the root cause helps you apply the right fix quickly.

When a hub stops working, the first suspect is power. Bus-powered hubs draw all their power from the host computer's USB port, which may not supply enough for multiple devices. This can cause intermittent disconnects or devices not being recognized. Powered hubs with their own AC adapter avoid this issue. Another common cause is outdated or corrupted USB drivers. Windows and Mac both rely on generic drivers that can become unstable after updates or conflicts. Finally, cable quality and length matter: long or low-quality cables can degrade signal and power delivery.

How to Fix a USB Hub That Has No Power

1. Check the power source. If your hub is bus-powered, unplug it from the computer and plug it into a different USB port. Avoid front-panel ports on desktop PCs; use rear ports connected directly to the motherboard. For powered hubs, ensure the AC adapter is plugged into a working outlet and the hub's power LED is on.
2. Test with a single device. Disconnect all peripherals from the hub, then connect one low-power device like a mouse or keyboard. If it works, add devices one at a time. If the hub loses power when you add a high-power device (e.g., external hard drive), the hub cannot supply enough current. Consider a powered hub with at least 2A per port.
3. Inspect the USB cable. A damaged or loose cable can interrupt power. Try a different USB cable that supports data and power (USB 3.0 rated). Keep cable length under 3 feet (0.9 meters) for best performance.
4. Update or reinstall USB drivers (Windows). Open Device Manager, expand "Universal Serial Bus controllers." Right-click each entry (especially "Generic USB Hub" and "USB Root Hub") and select "Uninstall device." Restart your computer; Windows will reinstall drivers automatically. For Mac, reset the System Management Controller (SMC) and NVRAM: shut down, then press and hold Option+Command+P+R on Intel Macs, or simply shut down and wait 30 seconds for Apple Silicon.

How to Fix a USB Hub Device Not Recognized

1. Try a different port and computer. Connect the hub to another USB port on your computer. If possible, test it on a different computer to rule out a hub hardware failure. If it works elsewhere, the issue is with your original computer's USB controller or drivers.
2. Check for driver conflicts (Windows). In Device Manager, look for devices with a yellow exclamation mark. Right-click and select "Update driver" > "Search automatically for drivers." If that fails, go to the hub manufacturer's website and download the latest driver (if available). For Mac, open System Information (hold Option and click Apple menu > System Information) and check under USB. If the hub is not listed, try resetting the SMC as above.
3. Disable USB selective suspend (Windows). Go to Control Panel > Power Options > Change plan settings > Change advanced power settings. Expand "USB settings" > "USB selective suspend setting" and set it to "Disabled." This prevents Windows from cutting power to USB ports to save energy.
4. Reinstall the USB controller (Mac). On Intel Macs, reset NVRAM: shut down, then press Option+Command+P+R for 20 seconds. On Apple Silicon, simply shut down and wait 30 seconds. Also, try disconnecting all USB devices, restarting, and reconnecting the hub.

How to Fix Slow USB Hub Speeds

1. Use a USB 3.0 hub with high-speed devices. If your hub is USB 2.0, it will bottleneck modern SSDs and external drives. Upgrade to a powered USB 3.0 hub (5 Gbps) or USB 3.1 Gen 2 (10 Gbps). Check the hub's specifications to ensure it supports the speed you need.
2. Avoid mixing USB 2.0 and 3.0 devices. On many hubs, connecting a USB 2.0 device can force all ports to USB 2.0 speeds. Keep USB 3.0 devices on separate ports or use a hub that supports per-port speed negotiation. If possible, plug high-speed devices directly into the computer.
3. Check for bandwidth saturation. USB hubs share total bandwidth among all connected devices. If you have multiple high-bandwidth devices (e.g., webcam, external drive, network adapter), they may compete. Disconnect non-essential devices or use a hub with multiple downstream ports that each have dedicated bandwidth (rare, but some high-end hubs offer this).
4. Update firmware and drivers. Some hubs have firmware updates that improve performance. Visit the manufacturer's support page. Also, ensure your computer's chipset drivers are up to date, especially for USB controllers.

How to Fix Intermittent Disconnects

1. Eliminate power issues. Intermittent disconnects often stem from power fluctuations. Use a powered hub with a stable AC adapter. Avoid using extension cords or power strips with the hub's adapter. If the hub is bus-powered, connect it to a USB port that provides consistent power (e.g., a powered USB port on a desktop).
2. Check for loose connections. Wiggle the cable at both ends. If the disconnect happens when you move the cable, replace it. Also, inspect the hub's ports for debris or damage. Use compressed air to clean them.
3. Update drivers and disable power saving. On Windows, go to Device Manager, find each USB Root Hub, right-click > Properties > Power Management, and uncheck "Allow the computer to turn off this device to save power." On Mac, go to System Preferences > Energy Saver and uncheck "Put hard disks to sleep when possible" and "Enable Power Nap." Also, reset SMC as described earlier.
4. Reduce interference. Keep the hub away from other electronics like Wi-Fi routers, microwaves, and Bluetooth devices. USB 3.0 can cause 2.4 GHz interference; if you use wireless peripherals, move the hub farther away or use shielded cables.

When to Replace Your USB Hub

If you have tried all the above steps and the hub still malfunctions, it may be time for a replacement. Signs that a hub is failing: it gets excessively hot, causes system crashes, or stops working on multiple computers. Also, if your hub is older and only supports USB 2.0, upgrading to a modern USB 3.0 or USB-C hub can solve speed and compatibility issues. When shopping for a new hub, look for one with its own power supply, enough ports for your needs, and positive reviews regarding reliability. Check the current price on Amazon for popular models from brands like Anker, Sabrent, or Belkin. A quality powered hub typically costs more but saves headaches in the long run.

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