Incredible Problem

So I have a strange problem, and I have no idea what's causing it. First off, watch this video which shows what's happening.

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So.. what? This first happened a few days ago, then yesterday, and now today. I haven't changed anything hardware, software, driver, settings, or OS wise for weeks.

While the screen is gone, my computer is definitely alive, though not fully. I had music playing this time, and my music carried on like nothing was going wrong. The times when it did come back, my display was partially frozen, as in I could move the mouse but that was it. I tried moving a scroll bar but it didn't do anything. Then a few flashes later it suddenly updated, as you see in the vid.

Also you can see in the top left corner something. That's actually a chunk of the firefox window I had open ;_;. To fix the problem I just reboot and it's fine. I checked my temps after booting back in and my CPU is a cool 38C. My graphics card I can't check the temperature of, though sticking my finger in my case and onto it, it's nowhere near hot.

So what's happening ;_;

Jam it back in, in the dark.