Ok. I have a customer who called me with a Dell Dimension 4100 that wouldn’t boot. The screen wouldn’t show anything and the light on the keyboard and mouse wouldn’t turn on. I went to their home checked it out and it looked like a motherboard problem. Then I brought it back to the shop. When turned on all it would do is make 3 long beeps. According to the Dell website, 3 beeps mean that there is a problem with the RAM. I reseated it and tried different RAM and tested all the parts individually, everything looked fine. Still nothing fixed the problem. I informed the customer that the motherboard was bad and ordered a replacement. I installed the new motherboard, turned it on and everything was great. It booted into Windows several time. I wanted to run PC Check on the computer, so I made a floppy and started the program running a 1 hour test. Everything was great, everything was passing. Then I looked away for 5 min and looked back and the screen was black. Nothing would show. I restarted the computer and it wouldn’t boot, started giving me keyboard errors, and then wouldn’t even display the Dell splash screen. Then to my HORROR, upon boot, it made 3 long beeps and the light on the keyboard and mouse wouldn’t turn on.
What could be the problem? What does the 3 beeps really mean? Thanks