TS4559 I don't know if this was already asked, but every time I put my headphones on my iMac OSX (2007 version) I always hear it on a different output then my headphones. But they worked last time...  I just don't know what the problem is...

It just happen to me today... while I was listening to music it went to a different output. But strangely... it works on my ipad 2 wifi.
If this happen to you PLEASE reply. Thank You.

Hello pagtaljav1,
It sounds like you're not hearing audio from you headphones when connected to your iMac.  You may want to check the output settings in System Preferences.  You can find the steps to do this in this article:
OS X Mountain Lion: Change your computer’s sound output device
http://support.apple.com/kb/PH11235
If the setting is correct there, and you are still not getting audio from the headphones, I recommend resetting the NVRAM / PRAM:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Thank you for using Apple Support Communities.
Best,
Sheila M.

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