Sorry to hear about your sound problems.
1. We can't
diagnose your problems with the information you have left us.
If your speakers are with a
amplifier, you may have a Bad Amp.
If you do not, you may have a Bad connection to the rear of your PC.
If you have a amplifier hocked up to your system, most of the time, if you unplug the sound, at the rear of the unit, you can hear a static sound, if you can hear this, your amp is working and you may have to
reload the drivers for the sound system on your pc.
Before going
thru all this trouble, you should check all connections first before proceeding any further.
Hope this
information has help you somewhat. !!
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John Ray