Computers & Internet » Hardware » Desktops » Built a computer from garage sale parts... aka used and not sooo old but they work decently and theres a prob.?

Built a computer from garage sale parts... aka used and not sooo old but they work decently and theres a prob.?

yeah, like the computer turns on and stuff, but like...
it turns off after around ... idk, 20-30 sec, but the day before i installed win 7 it didnt turn off..??
i changed the ram to 1 single brand and kind (not mixed) - same...
changed the fan, maybe it didnt like it and idk y that wud happen - same...
changed that lithium battery thing on the south bridge part of the motherboard - same...
i have no replacement processors sooo idk bout that but i dont think its that cuz it turns on....sooooooooooo yeah...
i HAVENT tried the power supply, and i know the board is NOT dead...
suggestions???

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