Sound Preferences: switches from Internal Speakers to Digital Out

I've been having this problem recently. I sent the computer off to Apple a few weeks ago and it helped for a while, but no longer.
My computer has a problem with it's sound output jack or something. Without inserting anything into the plug, the Sound will change for "Internal Speakers" to "Digital Out" and to "Built-in Output" in the Sound Preferences Panel.
Any suggestions?
Message was edited by: davidszcz

I have a 4 month old macbook and experiencing the same problem. Just realized it after installing itunes 8 and since then having a stuttering audio playback problem too. When i plug my headphones into the audiojack the sound switches from headphones to speakers and back as well as itunes playing tracks in a stop and go mode. I repaired the rights several times, installed quicktime 7.5.5 again, reinstalled itunes 8 and for sure running the latest leopard version 10.5.5.
Also thought it could be a hardware problem but after reading this it seems more software related.
Any idea?

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