[Supertoaster]

I was in a game earlier and everything was working perfectly. Suddenly I started to hear a really loud buzzing sound coming from my headphones. I thought it was my headphones so I tried replugging them into the jack on my Xonar and suddenly my computer BSOD'd.  When I restarted I plugged my headphones in again and it didn't work. My onboard worked fine so I knew it wasnt the headphones. I tried seeing if the card had gotten loose from the PCI slot and it hadn't.
 
Any help? :C