The worst part is it is all just too complicated to work out why. My desktop seems to freeze and full crash once every few days and I have no idea why or even how to work out. Since it is custom built, I can't just take it to the apple store and say I want a new one.
It usually is the RAM that has developed a fault. Run memtest[0] to detect errors. Otherwise, in descending order of likelihood, it could be the motherboard, psu, some driver/kernel crash caused by peripheral, or bad cpu.
