Windows 7 x64 - Automatic Updates installed a new driver for my ATI Radeon HD 3400 series graphics card, which caused the HDMI audio output to stop working. Control Panel reported it as "Not plugged in".
A quick google suggested it may be a clash between the ATI drivers and those for the onboard Realtek audio.
Solution: manual installation of new audio driver.
http://www.realtek.com.tw/downloads/ -> High Definition Audio Codes -> ATI HDMI Audio Device (not sure why it was red)
After a quick reboot, everything's back to peachy.
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