Nope, it isnt the keyboard. I have swapped out 3 keyboards. It only occurs when I shutdown (as opposed to restart) Windows XP. If I shut it down I have to unplug the pc and plug it back in when the power is off. Then I can power it on and the keyboard is there. If I dont pull the power cord, no KB. The reason Im puzzled is how the PC knows Im yanking the cord when its completly turned off???