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Tower not coming on

\015 I shut down my tower and then disconnect all cords to clean and when hooked eveything back tower will not power up. Dont know if i actually there is somethign wrong? Had this problem befor when i lost power and unplugged everything and let set and then it worked later. Is there something internal that has to wait like a reset button?\015

Answers :

Check the power supply, if you don't hear any whir at all from the fan, power supply needs to be replaced.
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