No audio via headphone socket - Mac Mini

2010 Mac Mini 10.6.8
No output via the headphone jack. Audio is working OK via internal speaker / HDMI / Bluetooth / Airplay.
There is a signal going through the socket and cable as noise can be heard (squeal, squeaks, etc, but not a distinguishable output)
1) Disconnected all USB's etc
2) Rebooted with different cables for audio and HDMI
3) Reset PRAM
4) Apple Hardware Test - all OK
5) Tech Tool Test - all OK
6) Checked all setting in Audio Midi/sound preferences
Any ideas? - Thanks

Trip to Apple store and Genius Bar (Genius my a**e!), where I had a 2 hour wait, 20 minutes with the Genius (I use the term lightly) to be told what I already knew, plus he thinks the headphone output is connected to main logic board and that will cost almost £300 for parts. Dream-on!
On the way home I purchased a £8 Toslink cable (same was £32 in Apple store) plugged it in and hey presto - perfect sound.
So it looks like the headphone socket is stuck in digital mode.
Well at least it's a marginal improvement. Now off to research & establish how many other folks report same issue.

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sorry for my english in advance
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