As the title says, my computer is switching its self off. Sometimes its before POST, sometimes after, once it booted the OS before it went. I'm assuming its the PSU that is playing up, but I would just like to go through the possibilities of other faults with you guys first. As it booted the os the motherboard, ram, HDD etc are obviously working ok. I did think that it could be the CPU over heating forcing it to shutdown. But the fan is working fine, and the whole system is fairly new (was built early this year) so I wouldn't have thought it to be that.
I will try and get it running for long enough to see if I can get any temp readings. I thought it could be the On/Off switch, so I unplugged it from the MB. My MB comes with a Diognosis Card which has a Power and Reset switch on it, so I've just been using that, and still the same problem.