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BrianLachoreVPI

 
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Member Since: Feb 24, 2011
Location: Maryland
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Mac Specs: March 2011 15" MBP 2.3GHz i7 Quad Core 8GB Ram | Mid 2011 27" iMac 3.4 GHz i7 16 GB RAM 2 TB HDD

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Quote:
Originally Posted by slam5 View Post
Come to think of it, I never had this problem when I was connected to my pc. Does the PC have better grounding than the iMac.
It definitely sounds like a grounding issue - as has been pointed out. Have you tried a different outlet - for instance - the one that the PC was in that didn't exhibit the problem? Turn off lights - and any other appliance/electronics that may share that outlet's circuit.

It just wouldn't make any sense for the PC to have "better" grounding, not as a general statement, unless you happen to have a grounding issue with your particular iMac for some reason - or perhaps just your audio jack. Maybe your UPS is introducing the hum?? Try it without.
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