HT201191: Install memory in an iMac
Learn about Install memory in an iMac
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Helpful answers
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Apr 26, 2012 2:40 PM in response to schornrby BGreg,You probably followed these steps to install the memory: http://support.apple.com/kb/HT1423
Since you have an Intel iMac, reset the SMC and PRAM:
SMC:
- Shut down the computer.
- Unplug the computer's power cord.
- Wait fifteen seconds.
- Attach the computer's power cord.
- Wait five seconds, then press the power button to turn on the computer.
PRAM:
- Shut down the computer.
- Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
If the iMac doesn't recognize the newly installed memory after doing that, reseat the memory and reboot.