Are you sure that the screen is working?
if yes unplug everything (screen, keyb., mouse..)and try to turn it on. If your ear an alarm then it's one of your peripheral,.
when not the power supply, the motherboard or the Microprocessor is dead.
you can easily check the power supply with a millimeter (open the box, take the power plug from the DVD and measure if you have +5V and +15 V)
For the others..only replacement can solve the problem.
cheers
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