I recently got a new processor but for some reason when i put it in...and yes before you ask it is in the right way...my pc turns on but not completley. By this i mean it all starts running the fans and everything inside, but my monitor will not come on at all. I do not know if i need a new power supply or what. PLease help this is driving me crazy. What are your PC's specs? And not TRYING to insult your intelligence or anything, but just have to ask, are you sure your motherboard can support that processor? Same socket type and all?Thermal paste applied properly ? ?
Sounds as THOUGH the auxiliary power cable is not plugged into the motherboard.

Good LuckI would also check that the CPU was compatible with the motherboard. The manufacturers website usually has the specifications of the board plus a CPU compatibility list, if you can't find a list, post the brand and model here, and the CPU you purchased and we may be able to shed a better light on it I say SOMEONE forgot their thermal + heatsink