bobafett573 said:i just installed a GeForce 6600GT video card and another 512mb stick of RAM.
so how was it working prior to the upgrades?
maybe you have a bad stick of RAM, that sometimes cause instability at boot up.
also...what slots did you put the sticks in?
check your mobo's manual and see if it's supposed to be in a certain order.
also, take out your vid-card and reboot and see what happens.
try it w/ the new stick of RAM too.