I have a 24" mid 2008 imac when i plug the head phone jack into my stereo i have a hum that never goes away.

i have tried grounding both the head unit and also the computer it self and all i find is the noise is still there. what can i do to get rid of the noise? i think the problem is in the grounding of the head phone jack it's self but i dont know. has any one else had this same problem? thanks for your time.

How did you confirm grounding? How old is your house? Does it have 3-prong outlets? If not, there's no guarantee they are wired right even if they are the ones with one wider prong slot. If they are 3-prong, that's still no gurantee they are wired right. You would need one of the below to be sure. Just trying to save a lot of troubleshooting of devices when it could be your house wiring.

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