I've tried holding down F10 & F8 (I cant remember which one took me into the BIOS setup but according to HP website one of those should get me to a diagnostic program) but nothing. I dont even get the 'beep' sound for the power on password prompt; I dont think its making it that far. I've reseated the RAM a few times as well as tried various configurations of RAM (only 1 stick in at a time, etc) but still nothing. I removed the RTC battery in order to reset the CMOS but that didnt work either. This is really starting to bother me b/c I think its something very simple I'm overlooking.