i got a new case for my computer and switched out the parts now after doing this the computer will start up then it restarts by itself and then it wont restart again but it has no video signal at all for the screen i have put evrything in the old case and i have the same issue i have tried a diffrent hard drive and a diffrent video card i was thinking that maybe the motherboard got damaged and is causing it or if there is something else you guys know of?