I've had a similar problem before. I have my stereo hooked up to my computer so I can listen to music through it. Sometimes I would unhook it (to hook it up to my tv for good sound) and rehook it up to my computer. When I did that, and if both the pc and stereo were on, sometimes it would short out the sound card. None of my media players would work. I would go to a song or video and the play bar, or status bar, wouldn't move. I just pulled out the sound card and put it in a different pci slot, restarted, and it would redetect the card. Then if I wanted, I could turn off the pc and put the card back into the original slot. Either way worked for me though. Hopefully this works for you, or it atleast leads you to find the problem.
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