Brillis Wuce said:
Hate to be the bearer of bad news, but this is nothing simple. Most likely, your GPU is on its way out.
There are other possibilites though. The PCIe slot could of gone out, or the line coming from your PSU went bad.
Try 2 things...
Another 6 or 6x2 pin power connector, and reseat the video card (in another slot, if you have one).
Even funnier is now that I took a longer break and updated the driver (somehow didn't update to the newest one, but I doubt that was the CAUSE of the problem since I do regularly update it), it seems to work again, and normal as far as I can tell. I really don't feel safe about it and still curious to know what happened in the first place. But I guess I will take what I can get and run with it. Another quick google yielded that minecraft has known to cause some weird crashes on PC once in a while. But to such extent goes beyond my imagination (how could a game crash the entire system in a way that even after turning off, waited, then restarting doesn't work at some point?) Hopefully it won't occur again.
Thanks for the brief answer and help anyways though!