After a while (about half an hour) booting up my system, some of my keyboard keys become unresponsive. Their respective Shift+, Ctrl+ and Alt+ combinations are also unresponsive. Pressing these keys do just nothing. When I restart (or power off and reboot) my system they become active again for a while.

I haven't installed any particular software that remaps the keyboard keys or does anything similar. My operating system is up to date. I'm very careful with viruses, I have Comodo antivirus installed.

I tested this keyboard in another USB port (without restarting the system), and the problem was same.
I plugged (without restarting the system) another keyboard to that USB port (to the one which the problematic keyboard was originally plugged in), and the new keyboard was functioning alright.
EDIT: I tried these tests with restarting system too. The results were the same.

How can I detect what software is causing this in my PC? Or is this just because of my keyboard being broken (a hardware failure)? Do I need to buy a new keyboard?

The problematic keys are:

  • The Left CTRL key
  • Some certain function keys: F1, F2, F8, F9
  • Two number keys: 5, 6 (not the ones on the number pad)
  • Some special keys: Ins, Del, Home, PgUp
  • Some punctuation characters: " (quote), * (asterisk), - (hyphen)

My OS: Windows 7 Ultimate x64 SP1

  • It's either your USB port or the keyboard. Test with another keyboard, and test with this keyboard on another port or computer. Then come back and tell us what happened. – user3463 Jul 13 '12 at 4:38
  • @RandolphWest I added the test results to my question. – hkBattousai Jul 13 '12 at 5:38
  • Are you saying that the new keyboard works? If so, the old one is broken. – user3463 Jul 13 '12 at 16:04

Yes - using a new keyboard will tell you if it is a software or hardware problem. I would suggest getting a new keyboard!

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