What causes mouse, keyboard, & monitor not to come on?

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ac3mark
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mouse, keyboard, & monitor not to come on?

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No power to the device. Try plugging it in. If you plug a lamp into the same outlet, does it turn on? No, the power outlet is bad. Turn on the light in the room, did it turn on? No, pay the power bill!
Bella4009
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PC boots, lights, fans, etc come on. Just not the monitor, mouse, & keyboard. Tried the HDMI to video card & onboard HMDI..nothing.
ac3mark
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If the fan spins, but the numlock key does not toggle on and off when pressing numlock, the pc is not booting and there is a hardware failure!