I GIVE UP ON THAT DAMN COMPUTER!!!!!!!!
T_T I'll never be able to fix that. T_T
Everything happened after installing a new HD.
Turn on > PC power on > Monitor no signal
Did replace psu with stronge
try to put back the old hd, if still work maybe the power supply and the motherboard are the problems! you have almost the same problem with my classmate! his technician suggested him to buy new power supply and motherboard.
you can also consult technician near from your place, im sure its free and give you more info to fix your computer",