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Fix a USB port that will not work

We'll rule out cable and device faults, check power and drivers, then isolate a bad port or controller—or tell you when to call support.

Troubleshooting · Home maintenance
5–15 min
What you'll need
  • USB device and cable
  • Another USB port or computer (to test)
Step 1 of 7

Quick triage — pick your path

Quick triage — pick your path

Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Rule out cable and device faults, then isolate a bad port, driver, or controller.

  • Plug the device into another USB port on the same computer.
  • Good: The device works in a different port—the original port may be faulty. Use the working port or see When to get help.
  • Bad: The device fails in every port—proceed to Try different port and cable.

Try different port and cable

Goal: Rule out a bad cable or loose connection.

  • Unplug the device, wait five seconds, plug back in firmly. Check for a loose connection.
  • If the device uses a removable cable, swap it for a known-good cable. USB cables can fail internally.
  • Try the device on another computer. If it works there, the problem is with the original computer.
  • Good: The device works with a new cable or on another computer—you have isolated the cause.
  • Bad: The device still fails—proceed to Check drivers and power-cycle.

Check drivers and power-cycle

Goal: Fix driver or controller issues.

  • Windows: Open Device Manager, expand Universal Serial Bus controllers. Look for yellow exclamation marks. Right-click the controller, choose Update driver or Uninstall device, then restart.
  • Mac: Restart the Mac to reset the USB controller.
  • Power-cycle the computer: shut down fully, unplug from power 30 seconds, plug back in and start. Then plug in the device.
  • Good: The device is detected after the driver update or restart.
  • Bad: Every port still fails—see When to get help.

When to get help

Call the manufacturer or a technician if:

  • Every USB port fails after trying different cables and devices.
  • The port is physically damaged (bent pins, debris inside).
  • High-power devices fail—try a powered hub first; if that does not help, call support.

Verification

  • The device is detected when plugged in (connect sound or device appears in the system).
  • No yellow exclamation marks in Device Manager (Windows) or errors in System Information (Mac).
  • The device works consistently in the port you use.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Try different port Plug the device into another USB port to isolate a bad port.
  2. Try different cable Swap the cable to rule out cable failure.
  3. Check drivers Update or reinstall USB drivers; check Device Manager or System Information.
  4. Power-cycle Fully shut down, unplug power 30 seconds, restart.
  5. Call support Manufacturer or technician if all ports fail or port is damaged.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Computer make and model
  • Whether the device works in another port or on another computer
  • Device Manager or System Information output
  • Steps already tried

Does the device work in a different USB port?

Plug the device into another port on the same computer. If it works elsewhere, the original port may be faulty.

Plug the device into a different USB port. Good: device works in another port—original port may be bad. Bad: device fails in every port—proceed to check cable and device.

Yes No

You can change your answer later.

Use the working port or call support

Use the port that works. If you need the faulty port, call support—the port or controller may need repair.

Done

Does a different cable fix it?

Swap the USB cable for a known-good one. Cables can fail internally.

Try a different USB cable. Good: device works with new cable—replace the bad cable. Bad: still fails—proceed to check drivers.

Yes No

You can change your answer later.

Replace cable and test

Use the working cable. The original cable was faulty.

Done

Does the device work on another computer?

Test on a different machine to isolate computer vs device.

Connect the device to another computer. Good: works there—driver or controller issue on original computer. Bad: fails on both—device may be faulty.

Yes No

You can change your answer later.

Power-cycle and update drivers

Shut down, unplug power 30 seconds, restart. Update or reinstall USB drivers in Device Manager (Windows) or restart (Mac). If still failing, call support.

Done

Call support

Call the manufacturer or a technician. The device may be faulty, or every port may have failed. Provide the capture checklist when calling.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a USB port stop working?
Common causes: a bad cable or device, driver issues, power limits exceeded, or a faulty port or controller. Try another port and cable first to isolate the cause.
Can I fix a USB port myself?
Yes, for software and cable issues. If the port itself is physically damaged or dead after ruling out cables and drivers, the motherboard or USB controller may need repair—call support or a technician.
When should I call support for a USB port?
Call support if every port fails, the port is physically damaged, or you have tried different cables and devices and the port still does not detect anything. A technician can test the controller or replace the port.

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