The machine is a e-Machine 390 running with a preinstalled XP Home.
When one first switches on it fires up and runs clean, I ran it for 24hrs with a number of applications looping. No problem. I have installed software, restarted the damn thing no problem. If it is shutdown it will not reboot, just goes into POST with a beep code of 1-3-3-1.
(its a new Pheonix Bios and this code shows a memory problem) BUT after about 20minutes (having switched off and removed the power lead from the back in order to poke around inside-nothing found) the machine powered up with no problem.This pattern repeats ad infinitum.
I can't think of a memory problem that cures itself after 20 minutes, but I tried the existing memory chips in another machine with no problem.
The only thing that I can think that could have such a long time constant is the smoothing capicitor in the PSU.
Is my analysis reasonable?
If it is what will happen when the smoothing blows?
Do we have any shrinks around as this is driving me round the bend