Computer boot up problems

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Earlier today my computer did something very strange, i was running no applications and i walked in and the computer turned its self off, so I tried to turn it back on again and it seemed fine for about 5 seconds before it turned itself off again (just after the windows was turned off abruptly please choose a start up method) it’s been doing this from then on wards. I've tried turning the power off for 30 seconds or so and turning it back on. It's not the psu because it’s practically brand new like 3 weeks old. I’m about to open it up and make sure something hasn't randomly come unplugged and possibly clean it out. Has anyone got any ideas?

System spec:
MSI K9N Neo V3 nForce 560 (Socket AM2) PCI-Express DDR2 Motherboard
AMD Athlon 64 X2 Dual Core 5600 2.90GHz (Socket AM2)
4 GB Ram
2 x 500 GB WD HDD's
 
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