The iMac has two RAM expansion slots. The factory-installed RAM slot accepts a standard PC133 168-pin DIMM (up to 512 MB in capacity) and is accessible only by an Apple Authorized Service Provider. The user-accessible slot (shown above) accepts a standard PC133 144-pin SO-DIMM and is normally used for added RAM. Only the SO-DIMM slot is accessible by the user. A SO-DIMM for the iMac computer can contain either 64, 128, 256, or 512 MB of memory.
Note: This procedure describes installing a SO-DIMM memory module in the user-accessible slot.
Warning: The computer must be turned off before RAM modules are removed or inserted. To remind you, a red LED is visible in the access door. If the red LED is on, power is on, and must be turned off before changing RAM modules.
4. Loosen the four captive screws at the base of the computer and gently remove the access panel.
Important: To avoid electrostatic discharge, always ground yourself by touching metal before you touch any parts or install any components inside the computer. To avoid static electricity building back up in your body, do not walk around the room until you have completed the installation and closed the computer.
5. Touch a metal surface inside the computer.
6. Unplug the power cord.
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