Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Strange problem...all of a sudden the keyboard stopped working. First it was the mouse AND keyboard, but I unplugged the mouse and then plugged it back the mouse is working but they keyboard isn't. When I say the keyboard isn't working, specifically I mean:

  • It is powered, and the numlock is lit.
  • Most of the keys do NOT work...only F5 works. I know this because opening up notepad and hitting F5 inserts the date. Also, the 'power' button on the keyboard (the one that sends the command to shut down the computer) also works.

This initially happened on my PS/2 keyboard, so I unplugged it and plugged in a rubber USB keyboard (the one that has the power button on it). Same deal. So I'm guessing it isn't specifically the keyboard that's the problem. So I uninstalled the keyboard from the device manager and then shut down the computer. I unplugged the power cable and held the power button for 20 seconds. I plugged the power cable back in and pressed the power button. It lit up for a split second then went dark again. I then hit it again and it boots up. The problem persists.

Windows Server 2008 on IBM ThinkCentre pc. I had installed windows updates recently and also installed a UPS. The UPS came first. I cannot go into BIOS settings because the keys aren't being sent!

share|improve this question
up vote 1 down vote accepted
  • try to reset the bios (remove battery)
  • try a linux live cd/dvd, see if the keyboard works
  • from windows look at the running processes
share|improve this answer
Removing then resetting the CMOS battery seems to have done the trick! Hopefully my mobo isn't on its way out the door. – JakeTheSnake Feb 24 '13 at 22:53

It is rare that PS/2 port go on the fritz, but anyting can happen.

You may want to borrow a USB keyboard and test. This may at least get you into bios where you can ensure that legacey support for keyboard and mouse are enabled. Then hook up PS/2 keyboard and mouse, boot up and see if they work. If not, the port(s) could have gone bad.

If the USB keyboard worked, it may be time to move to that instead of the PS/2 equipment. You can get them relativly cheap.

share|improve this answer
Again, I stated that I first used the PS/2 then transferred to USB and the problem persists. I don't know what to make of it :\ – JakeTheSnake Feb 24 '13 at 22:19
@JakeTheSnake - yess I see that now. – Carl B Feb 24 '13 at 22:19

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .