Last two weeks I spent my time fixing a PC (AMD Duron) of my friend. The problem is the system will restart or hang randomly. After troubleshooting, it appears that the rootcause is due to the following:

1. Faulty RAM (tested using Memtest)
2. Faulty PSU
3. Faulty motherboard (bulged capacitors found)

The first two are quite common to me. Having bulged capacitors is new to me (Probably due to cheap-made motherboard, in which I have to spend time finding display/sound/network drivers for it as there is no labeling on the board). A bulged capacitor is the one in which its top becomes a bump instead of usual flat surface.

As a whole, if you changed your RAM, hard disk, PSU, removed all PCI cards and still receiving BSOD, you should take a look on your motherboard.

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