About my Mac system info

In order to find out what kind of memory or other parts are needed to repair or upgrade your iMac, Macbook (Air / Pro), Mac Mini or Mac Pro. You need to provide the following information:

  • Serial number
  • Version of the operating system (OS X)
  • Build
  • Amount of memory installed
  • Optional the size and free space left

Click on the Apple Icon in the upper left corner of your screen and select "About this Mac"

Click on the grey text below the Apple logo in the "About this Mac" window to find: Serial #, Build and the version of the operating system you  are currently running.

Further below is the amount of Memory installed on this Mac.

Applications  > Utilities > Activity Monitor > "Disk Usage"