A USB port not working means nothing happens when you plug in a pen drive, mouse or phone cable: no sound, no light, no pop-up. Before blaming the socket, find out whether the port, the cable or the device is the weak link, because the three look identical from the outside.
Software and power settings cause most laptop USB faults, so you can fix them with built-in Windows tools. A physically damaged port is less common but does happen, usually after rough pulling or a bent connector. The steps below go from the quickest test to the deeper settings, and then cover pen drives and phone OTG, which have their own habits.
Common causes
1Faulty cable or device, not the port
How to tellThe port works with other devices but not with this one
What fixes itTry the device on another computer and swap the cable
2Temporary glitch in the USB controller
How to tellPorts stopped together after sleep or after a restart-free week
What fixes itShut down fully, unplug the charger, wait, and start again
3USB power saving turned the port off
How to tellDevice works after restart, then disappears after some time
What fixes itTurn off USB selective suspend in the power plan
4Driver problem after an update
How to tellDevice Manager shows a yellow mark under Universal Serial Bus controllers
What fixes itUninstall the controller entry and restart so Windows reinstalls it
5Dust, lint or a bent pin in the port
How to tellPlug feels loose or must be held at an angle to connect
What fixes itPower off and clean gently with a wooden toothpick or a blast of air
6Pen drive has no drive letter or is corrupted
How to tellDisk Management shows the drive without a letter, or it asks to format
What fixes itAssign a letter, or copy data off before formatting
7Damaged port or loose solder joint
How to tellNo port works with any device and nothing helps
What fixes itService centre repair; a USB hub on a working port can serve meanwhile
How to fix it, step by step
Try a different port, cable and device
Plug the same device into another port, preferably on the other side of the laptop. Then plug a different device into the first port. This one test tells you whether the port, the cable or the gadget is at fault.
Remove everything and restart
Unplug all USB items, restart the computer, and connect them one at a time. A single faulty device can stop a whole group of ports by drawing too much power.
Do a full power drain on a laptop
Shut the laptop down, unplug the charger, and hold the power button for about fifteen seconds. Plug the charger back in and start again. Do not open the laptop or remove its battery unless the maker's guide says you can.
Look for the device in Device Manager
Right click Start and open Device Manager. Expand Universal Serial Bus controllers and Disk drives. If you see a yellow warning triangle, right click the entry and choose Uninstall device, then restart. Windows will reinstall the driver on its own.
Turn off USB selective suspend
Open Control Panel, then Power Options, then Change plan settings, then Change advanced power settings. Expand USB settings, then USB selective suspend setting, and set it to Disabled for both battery and plugged in. Click Apply and restart.
Run the hardware troubleshooter and update Windows
Browse the extra troubleshooters in Windows settings for any USB or hardware entry and run it. Also install pending Windows updates, because many USB bugs are fixed there.
Check Disk Management for a pen drive
Right click Start and choose Disk Management. If your pen drive appears with no letter, right click it and choose Change Drive Letter and Paths, then Add. If it says RAW or asks to format, copy out what you can first with any other computer before you format.
Clean the port carefully
With the device switched off, shine a torch into the port. Remove lint with a wooden toothpick or a short puff of air. Never use metal, and never push hard.
Laptop USB port not working on Windows 10 or 11
On a laptop, the ports share a controller and a power supply, so a fault often shows up in all of them at once. If every port is dead but the keyboard on the screen and the touchpad still work, the controller or its driver is the likely culprit, not a broken port. If only one port is dead, check the socket itself for damage.
When the mouse or keyboard is the thing that has stopped, read our pages on mouse not working and laptop keyboard not working, which cover the cases where the port is fine.
You plug in a pen drive and Windows plays no sound. Device Manager shows Unknown USB Device (Device Descriptor Request Failed). That points to a bad cable, a worn connector or a power problem rather than to the files on the drive.
OTG not working on your phone
OTG lets a phone read a pen drive, a keyboard or a mouse through a small adapter. When OTG is not working, check these in order. First, make sure the phone supports OTG, because a few very basic models do not. Second, use a good adapter and try another pen drive. Third, look for an OTG option in the phone's settings; some phones switch it off after a few minutes of no use and need it enabled again. Fourth, format the pen drive as FAT32 or exFAT on a computer, because phones often cannot read NTFS drives.
Power matters too. A large hard drive may draw more power than a phone can give, so it needs its own supply or a powered hub. If a USB cable charges the phone but never connects to a computer, see USB tethering not working for phone side settings, and phone not charging if the cable itself is suspect.
Pen drive not working: what to check
| What you see | Try this first |
|---|---|
| Light blinks, drive not listed in File Explorer | Check Disk Management for a missing letter |
| Asks to format the disk | Stop, copy data from another computer if possible |
| Works on one computer only | Update Windows and USB drivers on the other |
| Not detected on any computer | Likely dead drive; a recovery shop is the next step |
Never format a drive that holds files you need until you have tried to copy them off. Formatting wipes the list of files and makes recovery harder.
When the port itself is broken
If no device works in a port and the port is visibly loose, bent or burnt, it needs a repair. Replacing a USB socket on a laptop mainboard is delicate soldering work, so the cost depends on how deep the port sits and whether it is fixed to the main board or a small separate board. A powered USB hub plugged into one working port is a handy workaround while you wait.
Frequently asked questions
Why is my USB port not working suddenly?
A sudden failure is usually a software glitch or a power setting, not damage. Restart, remove all USB devices, and then check Device Manager. If one device caused it, the port may recover once you unplug that device.
Laptop USB ports not working after Windows 11 update. What can I do?
Uninstall the USB controller entries in Device Manager and restart so they reinstall. Also turn off USB selective suspend in advanced power settings and run Windows Update again.
Why is OTG not working in my phone?
The adapter, the pen drive format or a phone setting is usually to blame. Try another adapter, format the pen drive as FAT32 or exFAT, and look for an OTG switch in the phone's settings.
My pendrive is not working. How to repair it?
First test it on another port and another computer. Then check Disk Management for a missing drive letter. Copy out your files before any format. A drive that no computer sees at all is probably physically damaged.
How can I check if OTG is working or not?
Plug a small pen drive or a wired mouse into the phone through the adapter. If a file manager shows the drive, or a pointer appears on the screen, OTG works.