So, as CR and Dsurian know, I've been having a few computer issues.
First, a few weeks back, I had walked through troubleshooting with CR - at first, we narrowed it down to an issue with the graphics card. Then, the computer messed up even with a different graphics card in it, and wouldn't even turn on. After a series (5+ hours) of tinkering with it, it powered up but never turned on (not even a single beep).
Now, I turned it on a few days ago just to see what would happen. It turned on just fine. I even played SWTOR on high settings (which it had not done before by default) and everything was smooth. So, just to be on the safe side, I made sure to turn it off and let it cool down. The next day, I tried it again - it shut off (power still on, but no input signal to monitor) on a loading screen. Today, I tried it again - both times, I got in-game and playing for about 2-3 minutes, then it would inexplicably shut off again, the same way (power on, system running, but no input signal).
So, I turned it off and tried turning it back on, and now I'm getting a steady beep like I used to get. I'm out of ideas as to what could be the issue here, so, fellow Shadow Knights - any ideas?