HP DV6-3010ax HDMI device disappears

Hi,
I have a dv6-3010ax and when I first log in, I can see the HDMI device in playback devices, but when I plug in the HDMI cable between the PC and my panasonic TV, the screen flashes off and on again (so it now mirrors to the TV), but the HDMI audio device disappears - so I don't get any HDMI audio.
I've updated to latest HP bios and ATI drivers, but it keeps disappearing every time I connect the cable. It never reappears, until I log off and on again.
Anyone got any ideas?
Thanks
This question was solved.
View Solution.

Fixed it - if I plug in the HDMI cable, then log off windows and log back on, it works. Alternatively, if the laptop is shut down and I plug in the HDMI cable and boot up, it is fine.
But if I unplug it or let the computer go to sleep, it stops working again (i.e. disappears from the audio device list).

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Originally Posted by petekdodd
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