2011 MBP Ticking & pinging noise

Hello,
My early 2011 MBP is making an incredibly annoying ticking / pinging noise. It comes from the bottom of the case, even when the computer is off. It is completely random but I can seem to produce it if I lightly tap or press on the bottom of the case around the edges.
I brought back the first laptop I had to Apple because of this noise. They replaced the logic board and processor. When I got it back it was still doing it. The manager of the Apple store swapped the laptop for a brand new one. The new one did not make the noise at first, but then after a few days it started doing it.
I tried removing all the screws, and then putting them back in a star pattern and tighetning them down. The noise gets better (doesn't do it as much) but will still randomly make the sound.
I have removed the hard drive and RAM and the MBP still makes the noise. And as I said, I know this is something in the case because it makes the noise when the laptop is completely powered off.
Any suggestions?
Thanks

There is a connector that is part of the RF sheilding that causes this.
http://www.6ixpassions.com/post/1095520847/fix-the-ticking-clicking-sound-in-you r-macbook-pro
DB

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Do a SMC reset:
http://support.apple.com/kb/ht3964
Run an Apple Hardware Test:
http://support.apple.com/kb/ht1509
You may need to use OPTION D to start it.
Install iStat pro and open Activity Monitor. Set Activity Monitor to show 'All Processes' and '%CPU' to display values from high to low. Post images of the two such as these:
Ciao.

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You really don't need to post multiple times, you will get attention eventually.
Find the reply here:
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2011 MBP Ticking & pinging noise

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