My Presario 2500 starts up and gets to the Windows XP screen then goes to a blue screen and stops. I have loaded a new "Compaq QuickRestore System Recovery" set of CDs but this does not solve the problem. When I use F8 / F10 to get to "Safe Start Mode" it sometimes goes into safe mode and sometimes not. When in safe mode everything seems to work. Do I have a flakey motherboard or processor or???