Fix keyboard not working at system boot (BIOS, boot loader, etc.)

Removing CMOS Battery

I have a 4-year old desktop PC, dual-booting Windows 7 and Ubuntu, that I finally turned on yesterday to play some old games. The problem was I couldn't select the operating system (using the arrow keys) when the boot loader appeared.

Then I realized that the USB keyboard connected to my PC was pretty much nonfunctional at boot time, i.e. it wouldn't work with BIOS or the boot loader. So how am I supposed to switch between the Operating Systems? How the hell do I fix this?

I came across this helpful post with some simple steps to fix the problem:

  1. Turn off your PC and remove the power cord.
  2. Open the CPU cabinet and remove the CMOS battery from the motherboard.
  3. Wait for 20 minutes, then place the CMOS battery back.
  4. Connect the power cord and turn on your PC.

The fix is to reset BIOS and it is done as stated above.

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