I had to change the CPU on my girlfriend's computer (long story). Anyway, I changed the CPU out without incident but now when I turn the computer on it doesn't boot up. Everything seems to turn on as normal but I can't hear the HD spinning etc. I've tried resetting the bios but that didn't help. The CPU I changed is the same speed, model, etc of the one that was in there. P4 3.0 GHz 1 gig Ram 120 GB HD Elite Group mobo (from Fry's) http://shop2.outpost.com/product/4236584?site=sr:SEARCH:MAIN_RSLT_PG If you need any more info let me know.