Audio problems - soft sound, no line-out detected

ok, so a number of things went wrong with my computer.
it was working perfectly, and i opened garage band up to record music, and all of a sudden, no sound was coming out. at this stage i was using the line-out to my stereo amp. it also wouldnt let me change the volume and came up with the circle-with-a-line-through-it symbol.
i did all the standard stuff, close garage band, play with the settings, go into system pref. restarted it, and then it was making some strange fuzzy noises, and system pref. said that no audio devices were detected, so i restarted again. now i only have built-in output detected, and its very quiet, even on full volume, the volume and mute controls all work.
so thats all of my problems. im currently running OS X 10.4.10 on an intel-based iMac.
thanks

Folks,
on Nov. 29, 2007 we have begun shipping a revised PocketDock Line Out USB, which is now iPhone-enabled. We have also revised the 1/8" stereo plugs on the included cables, so they are now thin enough to fit the iPhone’s recessed headphone jack.
Note that not all retailers might have the newest stock, so if you want to be on the safe side, either ask for which revision they sell (the iPhone-option is mentioned on the packaging) or order directly from http://www.sendstation.com.
Best regards,
André Klein
+President, SendStation Systems+

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Quote
Originally posted by Steve F.
You could try:
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Third time this has come up in 1 or 2 weeks.
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I appreciate the reply, but I believe you are wrong. Yes, I have searched the forum and did find that thread. Yes, I have read the manual. The only thing that it says is: "If you don't want to connect to the front audio header, pins 5 & 6, 9 & 10 have to be jumpered in order to have signal output directed to the rear audio ports. Otherwise, The Line-out connector on the back panel will not function." That's not my case since I want both ports to work (not outputting the signal both at the same time, obviously).
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Audio problems - soft sound, no line-out detected

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