IMac Audio Out Has Background Noise

I have an iMac 3.06gHz Intel Core 2 Duo with all updates.  If I use the headphone output or an external DAC there is the same noticeable digtial noise in the audio out. Scrolling the windows is audible and the noise changes with the scroll bar and other activities.  The noise is mostly low-pitched.  Sounds like an interal DAC that is passing clock signals or just under-engineered.

Try running a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.

Similar Messages

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