Volume locked on iMac

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My volume is locked it will only be full blast or I can mute. Tryed resetting the PRAM. Anyone know what's going on here?

 

[cheesygrin]

Do you have headphones or speakers plugged in? if so, try unplugging them and plugging back in again. Maybe try rebooting with them unplugged as well.

 

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I have done that a few times

 

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Pictures

 

[Mr. Retrofire]

Pictures

Try this first:
https://discussions.apple.com/thread/3192782?start=0&tstart=0

If that does not help, try this:
1. Repair the permissions on your startup disk with Disk Utility.
2. Restart your Mac in the so called safe mode. Wait a few minutes after this restart.
3. After 5 minutes, reboot your Mac again (normal, no safe boot).

This should solve possible problems with the Audio kernel extensions, if they have the wrong permissions.

Some older third party audio software installs incompatible kernel extensions, so make sure that you have the newest version. Even some screenshot utilities install audio kernel extensions.

 

[omvs]

Dumb question, but your output audio device is the internal speakers?

I believe I didn't get volume control when setting audio out to a HDMI device....