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:
- Turn off your PC and remove the power cord.
- Open the CPU cabinet and remove the CMOS battery from the motherboard.
- Wait for 20 minutes, then place the CMOS battery back.
- Connect the power cord and turn on your PC.
The fix is to reset BIOS and it is done as stated above.