Intel iMac sound only works out of one speaker, but both headphones...

Hello.
   I've run into a very interesting problem with the sound of my 20" Intel iMac's sound. Ever since I moved into my new appartment, my Logitech computer speakers have only worked out of the left speaker. The strange bit is that if I plug any pair of headphones into the same jack I get perfect sterio sound. I've check my sound preferences to make sure the sound is balanced, checked multiple pairs of headphones (that are all known to work perfectly), multiple pairs of computer speakers (that are all known to work perfectly), I even plugged in my M-Audio fast track USB audio interface with the same results (left channel only with speakers, sterio with headphones) Another weird thing is that I tested both pairs of computer speakers with my roommate's 20" Intel iMac (same model) and both worked just fine.
  I feel like I've run the gambit of things I could do to eliminate a faulty component. Do you think I have a faulty jack? something wrong with my software/hardware? I'm completely stumpped...anyone have any ideas?

You've done a lot of testing such that it sounds like the jack and plug combination of the Logitechs and the iMac are just a hair short now, and the move is the only thing that changed. Can you compare the headphone plug and the Logitech plug side by side for length? Is one of them a straight plug and the other a 90 degree such that it can't get all the way in now? I'm sure you've tried pushing it in extra hard or wiggling a bit. One guy on here awhile back sent pix of his headphone port and the one right beside it on the back of his iMac, and the headphone one was recessed slightly deeper into the iMac's body.

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