Sleep mode wake up problem

viannarella

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May 29, 2015
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I just finished building my first PC and since building I've been having a problem with the computer waking up from sleep mode. Within 25-40 minutes of going into sleep the computer wakes up no problem, but beyond that, when prompted to wake up, the display turns on, the motherboard lights flash, the fans start up and then the computer simply shuts off. When I press the power button again the computer turns on as if it were shut down normally. Has anybody had an experience like this/does anybody know how to fix it? I'm running windows 8.1 pro. Thanks
 

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