865G Neo2 suddenly powers off and won't reboot

I originally posted this in another topic but I guess I should have started a new one so here's the original post:
Motherboard: 865G Neo2 (MS-6728) Ver 1.(latest bios update 2.50); Intel Pentium 4 2.40GHz Northwood; Hitachi 80Gb hds722580vlat20; PowerColor ATI Radeon 9200 SE 128Mb R92LE-C3S (identified in windows as ATI Radeon 9250); 2GB DDR no-name ram; Macron MPT-400 400W power supply; Windows XP Professional SP2
Power supply stats:
+5V : 35A
+12V : 15A
-5V : 0.5A
-12V : 0.8A
+3.3 : 22A
+5VSB : 3A
All drivers in windows are up to date.
Problem is that the computer will just suddenly turn off. If you try to turn it on again it won't turn on. Removing the bios battery does nothing. Only way to make the computer boot again is to turn the power supply off with the switch on the back, wait a little while and then turn it back on. Very annoying as this is my work pc so the computer just suddenly turning off can be a real problem making me lose work etc. It even caused windows to become corrupt once not even allowing me to go into the recovery console to try and fix it. Had to do a repair install to fix it.
Any suggestions as to what would be causing it? I can only imagine that it's a MB or power supply problem. The fact that I can turn off the powersupply wait a little while and then am able to boot suggests to me that it's the motherboard. Some capicitors have to discharge and clear memory or something before the system will boot again. I'm at a loss.

Well the computer ran all day yesterday without dying once. Then this morning it died a short while after turning the computer on. So I looked around for another PSU and put that in. Unfortunately it's only rated as a 300W but I noticed that it has about the same max power for the combined 3.3V + 5V output being 200W compared to the previous 210W. Anyway even though it is a less powerful PSU I figure that the system I'm using isn't doing that much intensive work so it should be fine. So if this one also exhibits the same problems as the last one I will conclude that it's the motherboard and not the PSU.
Problem is that it will die just randomly whther it's under load or not or even just sitting doing nothing. So even if it doesn't die again today it doesn't mean that it's fixed. Ohwell... I'll tell you how it goes.

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865G Neo2 suddenly powers off and won't reboot

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