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Try these steps if your computer will not turn on and is showing no
sign at all of receiving power - no fans running and no lights on the
Important: You may or may not see a light on the back of your PC depending on the kind of power supply you have and the exact cause of the problem.
Note: Don't worry about the monitor yet. If the computer is not turning on because of a power issue then the monitor certainly can't display anything from the computer. Your monitor light will likely be amber/yellow if your computer has stopped sending information to it.