Headphone are pulsing

My headphones are not working properly. They just pulse the music. Sound effects are off. Sound is great thru speakers...
Any thoughts?
Mike

Can't say that I have seen (heard) of that before now, so I can only suggest a few things to try to determine if it's software or hardware related.
1. Open GarageBand and play a demo track and test the output.
(note: opening GB should reset the Audio MIDI Setup to default)
2. Reset the SMC > [Resetting the System Management Controller|http://support.apple.com/kb/HT3964?]
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
3. Reset the PRAM > [Resetting your Mac's PRAM and NVRAM|http://support.apple.com/kb/HT1379]
4. Download and install the > [10.6.2 Combo Update|http://www.apple.com/downloads/macosx/apple/macosx_updates/macosxv1062up datecombo.html] right over the top of the current 10.6.2
5. Create a new User Account or Log into another and test to output there.
I'm sure I have missed something software related that you might try..
Run the > [Apple Hardware Test|http://support.apple.com/kb/HT1509]
Don't hurt me I'm just trying to help, call > [Contact Apple Support, your Local Apple Store or Service Provider.|http://www.apple.com/support/contact>
Dennis

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