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To determine the operating system of your Mac OS X computer
- Click the Apple menu.
- Click the first item About This Mac (it could also be About This Computer if it's an older computer).
- In the new window, click the Overview tab which gives you information on your Mac's operating system. The Overview tab also gives information on
- The make and model of your computer (i.e. iMac 27 inch, late 2015)
- Processor
- Memory
- Graphics card
- Serial number