Monitor won't come out of sleep mode

Hello. I left my computer on for longer than I would have liked and it went into sleep mode and never came back out. I have tried all the common fixes that I could do without a monitor such as using the keyboard or mouse to wake it up from sleep (which has always worked in the past), unplugging devices, hard computer reset, and swapping cables. Monitor works in another computer. It has never done this before. It's a custom built computer I did years ago. Has anyone else had this issue that found a fix that works? Fixes that require a monitor are no good at the moment.

Processor: i7 2600k
Mb: ASUS p8p67
Graphics Card: Evga 680 sc
Windows 7
 
I'm unclear about your situation - are you saying that the monitor stays black from the time you press power button? No splash screen?
 
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