PC doesnt wake from sleep

Dell T3500. Configured in RAID 1.
I've turned off sleep mode and all other power management settings to never have my PC turn off.
About once a week, when I walk up to my PC and move the mouse/keyboard, the monitor stays black and there is no response. I can't even remote into my PC. The PC is on and the fan is blowing. I have to do a restart in order for the PC to come back up. A week later, it does again. I have updated all drivers and still have issues

Im starting to think its the motherboard.

Ideas?
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More about doesnt wake sleep
  1. Could be power supply, RAM, maybe the motherboard. Did you check the event viewer to see if there are any application crashes or other errors?
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