Audio Out from iMac

Hi there....on my iMac, suddenly I'm only getting audio out from the headphone jack at the back (which goes into my JBL Creature II's) on the RIGHT hand side. it does seem that suddenly the output jack socket has become defective....anyone else had this kind of thing?

Try it with something else, such as iPod earbuds, to make sure the problem is not on the speaker side.
Also, check System Preferences Sound pane Output tab to make sure the Balance setting did not get set all the way to the right side somehow.
If it's still broken, try resetting the PRAM
http://support.apple.com/kb/HT1379
Speaker volume parameters are stored in PRAM.

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