Volume locked in MacBook Air
I have a MacBook Air 4GB. OS X Yosemite is installed.
The volume appears to be locked. When I press the volume keys, all i see is the speaker icon with a cross underneath. It won't let me adjust it in the toolbar. In settings > sound, there is no input or output devices found, nor will it let me adjust the output volume from there.
I tried restarting the computer in safe mode, resetting the SMC, force quitting the coreaudiod, plugging in headphone/usb speakers, and nothing has worked.
Please help. This is really annoying.
^ screenshot of what the volume key does
MacBook Air, OS X Yosemite (10.10.2)