"Very gently" are the key words here. Try pushing it thru the motherboard at the posts with a screwdriver first. If you are going to pry it use something plastic like a credit card because there are traces on the motherboard that can be damage if you break one in the process of prying it off.
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For those special driving moments...
My idea of the PERFECT hotrod!!!!' ">http://www.fas.org/man/dod-101/sys/land/m2.htm