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Can't wake from long sleep, only black screen

Joined
Jan 30, 2014
Messages
191
Motherboard
Z87X-UD4H
CPU
Intel Core i7-4770k
Graphics
Gigabyte GV-N770OC-2GD (GTX 770)
Mac
  1. Mac mini
Mobile Phone
  1. iOS
Hello,

I can set my computer to sleep just fine and can wake it up after a short period. However if the standby mode lasts more than a couple of hours I'm unable to wake it up by pressing a key on the keyboard or mouse (both connected via USB). Even though the system responds by spinnig up the fans (louder than usual, sounds more like the noise at boot up), the monitors turn on but only showing a black screen.

Any suggestions would be highly appreciated.
 
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