For those curious, basically I restarted it last night, and then it simply failed to boot up. It would get to the welcome screen, flash blue and restart again. If I try doing start up repair, it gets stuck on a black screen with a movable cursor and nothing else. After lots of Googling, didn't really find all that much. As you might be able to guess, start up repair isn't meant to do that.
I went inside the latop to try reseating the RAM and whatnot, and none of the components are obviously damaged, as in nothing's on fire, but that doesn't mean much. Based on the information I've gathered, the hard drive is my main suspect, but right now I've got neither another laptop sized hard drive, nor anywhere else to stick this hard drive into, so I can't confirm it. The next step is to try and get it working with a Windows repair/install disc, which I am in the process of downloading and burning, but somehow I'm not feeling too optimistic.
Fortunately I back up my stuff fairly regularly, though it has been a little while since the last time, so I would end up losing a bit of stuff in the worst case scenario. Nothing too important though. I'm more concerned with simply not having a computer for who knows how long if I can't fix it. Oh well, here's hoping, I guess.