Macintosh Bible, 8th Edition, The

Precautions for Handling Memory

Memory modules are sensitive to static electricity. Never touch the metal contacts on the module or the pins on the memory chips. Leave the memory in the antistatic bag it ships in until you're ready to insert it into the Mac. Static electricity is easily generated in the typical home environment and is the No. 1 cause of component failure. Levels that may not destroy the part can still shorten its life. For maximum protection, wear an antistatic wrist strap available from computer and electronics-supply stores, and always discharge yourself by touching a metal part of the Mac's chassis before touching, inserting, or removing any parts inside the computer.

See your owner's manual or the Apple guides referred to ...