Lost headphone out in mac mini

Hi,
I've been happily using my mac mini for the last year, mostly for Garage band and music related things.
The other day I plugged in my hi-fi into the line out, and since then the headphone jack mostly doesn't work (it gives a series of clicks if I plug headphones in), and will stop anything playing music from working (I get a beachball until I unplug the headphones). I can get it to work briefly by putting the mac to sleep and waking it, but the sound is distorted and only comes from one channel.
I tried plugging in an SB extigy I had lying around, and it worked for about 5 minutes, but since then has also been silent.
I have zapped the pram, but to no avail.
Any idea's?
Thanks,
Pete
Intel Mac Mini 1.66Ghz core duo Mac OS X (10.4.9)

Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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Lost headphone out in mac mini

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