So i put in a new GPU. Turned on pc, it booted once, turned itself off and on again. No signal to monitor, no lights on Mouse or keyboard. Wont beep on startup, with or without ram. Fans and lights run fine. Tested PSU, its fine, and more than enough to Power the new GPU. So i put my old GPU back in, and it wont boot with this card either now. Do i have a broken motherboard and/or CPU?