Intermittent POST. Freezes when loading windows

[DasEinsamej]

Hi, this is my first time. I have a gm5045e gateway dual core. i got it from a guy who said the mobo was fried. well, i hooked it up and it didnt post. then, i proceeded to take all ram out. after turning on, it beeped and i shut it down. after replacing the ram, the computer POSTed. after a few shutdowns, it wouldnt POST anymore. after trying multiple other things, such as taking the CMOS batt. out, it finally POSTed again. I then preceeded to format a harddrive and try to load Windows. The computer froze and wont POST anymore. Ive researched this to the best of my ability and am fed up. help PLEASE...

 

[Tmagic650]

Remove the motherboard from the case and make sure it was not shorting to the case standoffs