A-3: this Step is to ensure system problem range, which makes your computer repairing process much easier and convenient. Look back, before the failure happens, did you ever install some new hardware, such as DVD-RW , networking card, or have you updated Video card drive or just installed some new antivirus software. If you really did one of these things, please enter Step A-4; if no, then please go to Step B-1.

A-4: supposing system failure is caused because you’ve installed some new hardware before happening, then this Step designed is to help your computer repairing more convenient.

Remove all new hardware installed before failure happening, then restart the computer. If the failure doesn’t happen, then the reason is the removed hardware. But don’t be anxious to affirm the problem of hardware quality, probably it’s just an incompatibility problem between hardware and motherboard. So test it on another different motherboard, and then to decide whether it’s a quality problem of the hardware. If the problem still occurs, then enter Step A-5.