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Core Duo i Mac computers should operate normally with a single DIMM installed in any slot, top or bottom.("Top" and "bottom" slots refer to the orientation of the slots in the pictures below.Modern Intel Ultrabooks and Apple Mac Books are becoming increasingly thin and light, and they aren’t designed to be user-upgradable.RELATED: CPU and GPU upgrades may be possible on some laptops, but these will be harder.Be sure to check the process ahead of time and see whether you’d feel comfortable following the instructions.Some upgrades will be much more difficult than others.Check exactly what type of RAM, solid-state drive, or other components your laptop supports.
This process can take 30 seconds or more, and the display of your i Mac remains dark until it's finished.
If your Mac continues to make the tone, contact Apple Support. The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory.
If all the memory in the i Mac has been replaced, it lists the new total of all installed RAM.
Do a search to see if your laptop has an official service manual you can use.
If not, you may find an unofficial guide for opening up your laptop and installing components written by another user.