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 stronger one. Did restart cmos in all ways possible. Did remove bat and ram for a DAY! Did reseated every parts. Did removed non essential parts of PC. Did removed newly installed HD NOTHING HAPPENED!!!!!!! (am going crazy!)