Hi,
I Uninstalled MPC, restarted and installed it again.(version 5).
it didn’t help 
i did look for any muted devices in my system and they all looked OK.
Any other clues you can provide?
maybe a log of some kind that can help you help me?
I Attached a screen capture,maybe it will help.
(btw, DirectX 11 is installed)
Thanks.
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All that I can suggest is that you explore the sound devices from your OS (you still haven’t mentioned what that was, BTW), to see if they are inappropriately configured.
You may wish to install a completely different player, just to see if it encounters similar issues. You might also want to review your system logs to see what you might have installed around the time that it all stopped working. You are still looking for what changed at that time, so don’t loose sight of the objective.