I built 3 systems with intel 600Mhz PIII/100mhz and 128meg PC133 memory, video/sound onboard. The boards are DELTA M81-X ATX. I have checked all jumper setting and had another person recheck all the settings they are correct(not many jumpers anyway mostly bios controlled). Bios setting are correct. Systems come on and run for about 10 mins and then locks-up. If I shut them off/on they function for about 2 mins and then lockup. The longer they are on the shorter between lockups (gets down to 30 secs) I have tried PC100 memory as well as other brands. It does not make a differance. (same for all three machines)
I have replaced the motherboards with PC133 M756lmrt . After installing the new motherboards I turn on the power. The power supply, CPU fan comes on, but no beeps(I checked speeker wires) and no picture nothing can't get to the BIOS.
I put the original boards back in and get the original results.
I don't believe it is a grounding problem because the power is coming on. I have tried changing the power supply. It has no effect.
I hope it's something simple.
Please help ASAP