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It was the motherboard after all! Oh well at least I have a spare PSU. Got a new Abit motherboard, lovely :) Thanks to everyone for their suggestions and help. :cool:

Hi, Took the whole PC out and tested the board, PSU connected, memory, CPU & 3 different gfx cards. Also connected a floppy drive to run the memory test. After various stages (changing memory, video cards) the machine still powered off even when not in the case so not a case issue. Not a...

Damn, I should have thought of that! Will try that later on and post results. Thanks

Ok, MB/CPU. GFX, one stick of memory. Started memtest and it got to 68% and then powered itself off. You advised to run it 5 times, but have changed the stick over to the other 512mb to see what happens and at 78% it powered off. Tried them both again and they both powered off, not at the...

No its not. It doesn't have any uv cables :) Ok, so I installed the PSU and the PC just powered itself off again. This is after stripping the whole PC down and reinstalling every component again so it isn't the PSU. Can faulty memory cause the computer to turn off just like that and not...

Thanks. I will get the Hyper 525w PSU and install it. Shall post if any other problems after the new PSU install

Thanks for both your posts and suggestions. I Checked all the leads from the PSU and hooked up a voltage meter to it and ran some tests and all fine. No shorts or lack of power. Removed and tested PSU in another machine for 6 hours straight and didn't power down once. Re-connected to the...

Reading some other posts from Willhub" the symptoms sound similar to mine, apart from the fact that my computer will shutdown at various stages; Whilst playing a game Normal desktop usage or idle Even before XP is loaded I tested the memory from a bootable disk - got to 20% and then the...