Strange noise coming from headphones in 10.5

When I listen to ANY audio through headphones on my MBP I get a strange "digital" sounding noise almost like it sounds like a bass drum is pounding underwater very faintly. This is a background noise but is very obnoxious when I listen to music 6-8 hours a day.
NOTES: On my MBP, it did not do this in 10.4 before I upgraded. I upgraded to Leopard on launch day and its been doing this ever since.
I work at an Apple Repair Center and we can't figure out the cause of this. On all the MBPs we test with the same hardware as me, each one produces this sound. On an iMac running the same version of OS X there is no issue. If I downgrade the mac to Tiger there is no issue.
Is Apple aware of this issue and what might be causing it?

Hi ClemTiger0408
There are many threads in Apple Discussions describing this problem, some people have said that resetting the PRAM or SMC has helped.
Instructions on how to reset the PRAM:
http://support.apple.com/kb/HT1379
Instructions on how to reset the SMC:
http://support.apple.com/kb/HT1411
Hope this helps
J.C

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Processor 3.2 GHz Intel Core i3
Memory 4 GB 1333 MHz DDR3
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Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I have read your post on how there is an unusual noise coming from your computer, and I would be happy to assist you in this matter!
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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Strange noise coming from headphones in 10.5

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