Unfortunately, I'm having a very strange problem where the monitor will stop receiving input and go to sleep after I close certain games. If I restart my PC, it will start just fine, but nothing will be displayed on the monitor. I have to turn the PC and the monitor off, then start them both back up again in order to fix the problem.
I am currently only having this happen in one game, being Call of Duty 4. Games that it has NOT happened in are ArmA II and CS:GO. I presume this is not a CoD4 specific problem, but rather a problem with something that CoD4 has which the others don't, perhaps a problem with the older version of DirectX it uses.
I also presume this is entirely caused by the GPU as I never had any problems like this until I installed the new GPU, but here's the rest of my PC components in case it helps.