been trying to hjelp a friend who gave me his compaq presario desktop which he purchased aboiut 10 months ago. Problem is when i turn it on, the fan runs for about a minute then nothing goes on. I dont hear the post process where usually a beep would sound when system is booting up. My question is how to diagnose if this is due to motherboard being bad? If so, what is best way to purchase another motherboard. Does it have to be specific to this model compaq? I assume i could also order at HP site correct? Thanks.