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My son powered down (i.e. shutoff) the computer by turning the powerstrip off. Now it will not respond when I try to turn it back on. Only black screen. Unhooked all peripherals to no avail.

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One technique that often works in this case is to reset the Power management circuits:
Remove the power plug, and any batteries, and leave for 20 seconds. Plug in the power lead, and hold down the power button for several seconds (until the power/sleep light flashes on some macs). Try booting up the computer again.

Posted on Mar 06, 2011

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