I recently fixed an issue with my computer randomly rebooting, and now, although it was working again, I started encountering this issue where if I turn my monitor off for a few hours, then come back and turn it on, there will be no input, and moving the mouse, or pressing keys does nothing. I know the computer is working, because I have a server running on it and I can still get a ping, but no matter what I do, it won't display any video. I've tried using different cables, a different monitor, and tired plugging the cable into my on-board graphics output instead of my video card, but still nothing. The last time this happened, I turned my computer off by pressing the power button, and then it wouldn't start up again. I had to fix this by starting the computer without the video card, and then putting the video card back in.
Here are my system specs:
Operating System: Windows 7 Ultimate (Currently not activated)
Processor: Intel Core i5-6500
Motherboard: MSI Z170-A PRO
Memory: G.SKILL Trident Z DDR4-3200 (2x8GB)
Video Card: EVGA GeForce GTX 970 SSC
Power Supply: EVGA 750 BQ