I just managed to get mine going again. What I did was run the following
diagnostics. Everything tested fine, and when I went back and opened a video
file with Media Player, the sound was suddenly back again even though the
diagnostics were uneventful.
Try to play the file in Mplayer2:
1. Click Start, click Run, and then type mplayer2.
2. Click OK.
3. On the File menu, click Open, and then select the media in question.
• Run the DirectX diagnostics as Windows Media Player is very dependent on
DirectX:
1. Click Start, click Run, and then type dxdiag.
2. Click OK.
3. In the DirectX Diagnostic Tool, click the Sound tab, and then click Test
DirectSound.• If the system cannot pass the DirectSound tests, it usually
indicates a problem with the sound card drivers. Normal playback of content
in Windows Media Player will not be possible.
I ran these tests. Everything checked out fine. For some unknown reason,
my Media Player sound is now playing again.