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1, Computer system fault diagnosis steps:
A, Distinct the problem is caused by software or hardware. When  power-on start it can display self-test configuration, then the computer system hardware is basically no problem, the failure is more likely caused by the software.
B, and then specify it’s the system software or application software failure.
C, hardware failure checking steps: first,judge the failure is caused by the host or external equipment, that is determined from the system to the device, and then from the equipment to the components.
By the system to the device refers to the computer system after a failure, to determine the host keyboard, monitor, printers, hard drives and floppy disks, etc. which device have problem.
We must note that some of the failures associated with, if the interface and the interface board down on the host, but may appear as an external equipment failure.
From equipment to parts means that if identified the host have the problem,there should be further determine the memory, CPU clock CMOS interface board in which component have the  problem.
In short, the computer system failure inspection step is, from soft to hard, from big to small, outside to the inside, step by step, strictly prohibit anxious and random operation.

2,Computer system fault diagnosis principle

A, outside to the inside;

B, first power then load;

C, external device then the host;

D, static to post-dynamic;

E,  general to special fault;

F, simplest to complex;

G, public to local fault;

H, major to secondary.