This computer has been working fine for years. Now it does not boot up. Pentium III MoBo Intel 815 Fan working. Not beeps. Not image on monitor screen. Graphics card and monitor tested on another computer and work fine. If not memory in slot it beeps. Power supply changed after measuring with voltimeter 4,5 v instead of 3,3 v. All peripherics out and still the same. CMOS battery taken out but no change. Try to recover bios using diskette but does not power diskette drive. Should appear any message in screen altough no peripherics are out ? Any ideas on what is going on and possible solutions ?