OS 10.9.5 update - No sound on my IMac now!

Ran the update last night. Woke up this morning and booted. The sound icon in top right is now grayed out. volume control is at the top of slider and can't be moved. Volume controls on keyboard bring up the square volume control indicator on the screen but dosn't move. System Preffs/sound also has a grayed out volume slider and mute button. HELP ME PLEASE i think my head is going to pop. I tried a re-boot and tried the headphones, but no change. Contact Apple support page also seems to be down. US and UK.

I had something like this a few days back, with sound only working with headphones. I just kept slowly putting headphones in and out of socket, as it seemed to be thinking they were always plugged in. Eventually it corrected itself!

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