Switch-mode power supply (SMPS) is the small unit behind the CPU tower which gives the power supply to the mother board and other devices in your computer. If you see that your computer is not being powered on, you can suspect the failure of SMPS. Ofcourse, there can be many other reasons. But the most common fault would be with the SMPS. Let me tell you how to check whether the SMPS is working or not.
Remove the SMPS from the CPU Cabinet and detach all its connections to the PC. Power it on and short the green and black wire (On 20 or 24 pin ATX). If the SMPS fan rotates, it is perfectly fine.
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