StarDestroyer.Net BBS

Hey guys seeing if I can get any help out here. Well I had just downloaded a game off steam. I was changing the graphic settings and then all the sudden when i clicked apply the computer or speakers starting making some ringing noise and the computer crashed. Now I try turning on the computer, it seems like it turns on but the monitor gets no display. I don't think that Windows is loading up since I don't hear the music playing. I tried unplugging and fastening the wires to the monitor and I've tried connecting it to the other graphic card (computer has two graphic cards) but nothing is working.

any suggestions or theories? Should I try replacing one piece or hardware or another and see if it works?

Oh it started working now after closing it and turning on a million times.

Still any theory on the problem and how to fix it so that it doesn't happen again in the future? I have noticed previously that at times my computer will open up and just stop and they keyboard and mouse would never light up. unplugging the computer and replugging it usually fixed that. This time the lights were lighting up though.