do it only if u r a professional.. assuming that the system bios hs not been flashed or updated in a wrong way..if so u gotta replace the m/b.. 1st see if the ram(s) is loose/faulty..open n resit it.. check for ac main supply and fuse..next check all the outputs of smps
viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg
& grey~sb); -12v (blue); -5v(white); +3.3v(orange)..if faulty try
repairing or replacing the power supply with a standby n see.. if all above are ok..check the cmos/system battery..(above +3v).. check the cpu fan rotating and the cpu generating heat..try replacing the cpu with a standby (if no heat is generated).. there may b a chance for m/b's crystal clock generator to b faulty..try repairing or replacing the m/b with a standby.. hope it'll b enough to solve ur problem.. seek professional assistance of ur system admin/vendor....
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