Motherboard does not power on

In the computer repair, always encounter press the power switch, what movement is not the case, the fan does not turn, the power LED is not lit.

This situation, first check the power supply, and then check the motherboard, and then use the minimum system method, unplug the memory, CPU, video card, sound card, hard disk and optical drive, only to the motherboard power. As a result, the motherboard did not respond after the power switch was pressed. Forcibly add electricity, or not to add electricity, you can initially determine that the motherboard is broken. Try to replace a new motherboard and then boot, found that the normal boot, everything works fine.