First of all, check if it is under warranty. Doing it yourself gives you experience and an adrenaline rush (*puts the case on* It should be OK now *ARGH*), but there are quite a few good warranties around, especially from smaller retailers/builders.
The most likely causes are:
a) Faulty RAM. The method given by Neat Hedgehog should work, unless all RAM sticks are faulty or your motherboard only takes RAM sticks in pairs.
b) Faulty CPU. Faulty Intel E8400 are exceptionally good at "it's not me, it's RAM" game.
c) Cooling troubles
d) It ain't coping with load or has a faulty USB device. Some PCs look like Zerg Overmind with all the USB cables attached to them.
Stripping it of all the peripherals (don't forget the flash pens) except for monitor is one way of checking
How old is it? Maybe there are few dust bunnies inside the case, which cause it to overheat?
Quote:
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I have asked a second opinion from my brother but I don't think it is very reliable.
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And what did he say? Unreliable opinion is still an opinion...
