First let me say I have an Intel Celeron 633 MHz 255MB RAM Windows XP Home SP1a Intel(r) 82810 Graphics Controller 111 gigs 2 fans inside BIOS PTLTD - 6040000 I have had the computer for about 5 months. Its an average late 90s computer. I used it everyday. A week ago it had been on all day then I just saw the screen go black then the monitor said please check signal. I tried to turn the tower on right after it happened but nothing happened. I unplugged it for a day then tried again the next day, the tower lights came on but no beeps and no bios. I tested the monitor on a different computer and monitor works, I also tried a different monitor on the dead computer still no signal. I dont think its the power supply. I think its the motherboard. I even switched the 3 volt battery and still nothing. Any suggestion would help.