T400s No Sound [ Edited ]

[tucow]

I had this problem on W7 X64. Try this:

Press the "volume up" or "volume down" key (left side to the blue ThinkVantage key), and the sound from speaker comes back.

Pressing the "mute" key brings the problem back, and pressing it again doesn't get the sound back. But the "volume up" or "volume down" key helps.

Hope this helps.

moderator note: subject line adjusted

[mamaHen]

THANK YOU VERY MUCH!!!!! 
Pressing the Volume UP or DOWN button next to ThinkVantage button WORKED!!! 
My symptoms were:
T400 Win XP, internal speakers not working, audio jack works, driver seemed ok.
I verified hitting mute did bring problem back which was resolved again by hitting Volume UP or Down.

Thanks again TUCOW

[liljeff]

Sure it helps, but what is the real problem? Why doesn't the mute button work and is there a real fix?

[auditstar]

Thanks a lot for your help. Now it works perfectly. The only difference on my laptop is that it works even after pressing and repressing the mute button. Perhaps the newest Bios version (1.20) fixed the described bug.