Cannot unmute

Today, the red touchkey icon above the function keys indicating the sound is muted was activated and I cannot deactive it; i.e. I cannot unmute my computer, and thus no longer have sound. I can unmute the sound via the volume control, but the red icon still stays on. If I press it the mute shows up again on the volume control. Any help would be appreciated.
I have:
HP Pavilion dv4-1465dx
Vista
Thanks!

OK every one i read some more and i think i found out how to fix the problem with no sound:
1 go to Control Panel
2 go to Device Manager
3 go to Sound, video, and game controllers
4 double click the IDT High Definition Audio CODEC
5 go to Driver on the top of the IDT screen
6 click Roll Back Driver...yes it takes away the most recent update but it worked for me
7 after it is done rolling back go back to the IDT screen and go back to driver and click the Update Driver... button...don't interrupt it let it do a search and update
if after those steps your audio still doesn't work properly then i cannot help any further
hope your sound comes back

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I muted the built in microphone in my macbook via the midi settings app from utilities. However I can't seem to unmute it. There are three channels M, 1 and 2. Channel 1 and 2 are on but the M channel is grayed out. Do you guys have any idea what is going on? I have tried to record a video via photobooth but i hear no sound recorded.
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First, make sure that it is recognized in System Profiler.
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So I am trying to iChat with my Dad who is in Kunming, China. We had an iChat a week prior to him leaving the U.S., everything was fine. I have had iChats with him in China before, no problems.
This time, for some reason the mic on his MacBook Pro is muted and no matter what he presses in iChat he cannot un-mute it. The video part of the chat works fine and he can hear me. He doesn't use any other programs that would use the audio input. I had him check in system preferences and the internal microphone is listed and active. He's 80 and not super savy with the MB Pro yet, though he's better with it than most people half his age... So many web sites are banned over there, he was concerned somehow or another his audio is being blocked. I can't imagine that would be possible, I'm sure it's either a setting or possibly a malfunction with the computer. If I have him reset his PRAM, would that cancel out any other program that may have hijacked the mic? We've tried on 2 separate occasions and he's restarted and no luck.
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Hi,
In iChat 4 and upwards the Video and Audio streams are on the same port.
This would make it virtually impossible to block one without blocking the other.
Just to double check
System Preferences > Sound > Input
Ideally this should have the Mic chosen and the volume set to make the blue bar get to at least 1/2 way (3/4s is better). It should not move so far that it bangs into the right hand end.
This will cause the OS software to "Clip" the Audio to prevent feedback - which means no input is made and you will hear nothing.
Next.
iChat > Preferences > Video section.
If there are two Inputs showing in System Preferences he will have a drop down
It should list the same device.
The green bar below the Video pic should also move (Although less than the blue bar did/does)
Headsets
If he is now using a Headset.
Change the iChat Option to anything but the headset mic.
Do the same in System Preferences > Sound > Input.
Now set System Preferences > Sound > Input "First"
And iChat > Microphone Drop Down "Last"
He may need to do this for an Output choice if it appears in iChat and in the System Preferences > Sound > Output.
He needs to be concerned with with getting Sound In to iChat as that is what you hear.
It is easy to think that it is Output as it goes over the internet to the Buddy.
More.
The Video Menu of iChat
In here the Microphone Enabled should be ticked
Selecting this items toggles the tick on or Off (And the Mic On or Off)
I would also check the View Menu
In here make sure the Show Audio Status is ticked.
This will show Audio icons next to the Buddies (Particularly if you deselect Show Video Status)
Show Video should allow Audio but it will not hurt to check.
In fact I would toggle the Microphone Enabled and both Show Statuses to make the App write the info to the .plist
Then try an Audio Only chat
You can do this from the Buddies menu (Or right clicking a Buddy) or by having Show Video Status Off.
Yet more.
I would also open the Connection Doctor from the Video menu at both ends during a chat
This will report the stats.
If his Bitrate is not stable then his audio may be effected.
iChat will try to cope with changes by Buffering the Video which means dropping frames which then means the audio is dropped as it will not be in sync.
You can try Limiting his Bandwidth in the Video Section of the Preferences to 500kbps
This will smooth out large variances when using Extremely fast services that vary.
500kbps is more than enough for a 4 way Video chat as Host but is a useful tool in iChat 5
If his Framerate also varies it will be a sure sign that his Internet speed is varying.
It may pay for you to drop your to 500kbps as well as hs end may be struggling to deal with high data loads from your end.
As a Last resort try both end at 200kbps (Anything below this will not Video)
Change one end at a time and keep an eye on the Connection Doctor to see when the end that has changed has settled. The Buffering will smooth out the change.
10:46 PM Wednesday; June 1, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
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redb22,
IIRC, the A2ZS Gamer card had the same installation CD as other versions. You can find it [url="http://www.filefront.com/5488235/SB_Audigy_2_ZS.rar/">here.[/url]

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Cannot unmute

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