I have a stand alone PC running Windows 2000. Recently it has started shutting itself down after aprox half an hour of use. Its as if someone has pulled the plug. After this has happened the power switch will not work and I have to switch it off at the socket first before I can restart it.
I have checked the temp and it is cool enough and I have tried replacing the PSU but still have the same problem.
Can someone suggest what could be wrong with it and how I can fix it.