This is a good one. 6 year old Packard bell PC running XP home sp3 it only has 256 MB RAM and needs a RAM injection. Did a crucial scan which was Ok and said that the max RAm was 2GB @ 1Gb per channel, so I ordered a 1Gb stick. when it arrived I installed it. Machine was fine, much faster, except the keyboard doesnt work.
When you press a key it beeps, put in a usb keyboard, same problem. Keyboard shows in device manager no problems. On startup you can use the keyboard to enter BIOS but when windows starts, no play.
I then moved the 2 ram chips around, no change I then restarted it with the original RAM chip, keyboard works.
Sent the chip back to crucial and ordered another one, this time I used the manual crucial selector rather than the scanner and selected using the motherboard, so got a slightly different chip.
I reckon it is a motherboard issue, but im confused as the problem only occurs after windows kicks in, so is it a driver issue?