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There are two major problems could happen. The first one is the easiest, update the sound card driver. The second one is more complex, it's a hardware problem which might cost a new sound card. The second reason is really rear unless you were experimenting with card. Thus, try the first one. Check the sound card manufacture website for new drivers which are compatible with your sound card. Download it and install. If it was problem with the driver it should be fixed after the update.
What else can I help you with?
Why my sound quit working?
We need more info simply other than your sound quit working
Why did your Windows and radio quit working at the same time on 2006 F-250?
Your windows and radio both quit working at the same time because you blew a fuse.
Your power windows quit working on your 1998 sable?
Check the fuse.
The power windows in your 2000 Chevy impala stoped working?
If all the windows quit working you need to look for a blown fuse in the fusebox.
Why did my power windows quit working on my 1998 Ford F150 pickup?
the motor for your power windows is shot, or your wiring is gone
What would cause the power windows heater fan and wipers to quit working at the same time?
your car stalled?
Can the speaker port go bad on a computer?
Yes the speaker port can and often does quit working.
Why did your power windows and radio quit working at the same time on your 2006 F-250?
That sounds like a bad fuse...
How do you get the keyboard on compac C300 to respond when it has quit working?
the keyboard on on my C300 laptop computer doesnot respond
How do you get the computer to quit scrolling down when I press space bar?
Try clicking the window that you are working in, that helps sometimes.
What could cause both front windows on your 1996 328I convertible to quit working?
If it both windows at the same time, it is likely to be a fuse related to the windows. Check you manual and/or fuse box for blown fuse and replace.
Why 2003 Acura ac unit quit working when you reset your Acura 2003 computer?
it may be the responders chip in the black computer behind da fuses
