The easiest way to identify an iMac is to open About This Mac and check the model information and serial number. You can then compare that information with Apple’s identification resources if you need the exact model year or technical specifications.
Check About This Mac
- Select the Apple menu in the upper-left corner of the screen.
- Select About This Mac.
- Review the iMac model information shown there.
- Record the serial number if you need to identify the machine more precisely.
The exact layout of About This Mac varies by macOS version, but it remains the best first place to look when the iMac starts normally.
Use the Serial Number
A serial number can help distinguish iMacs that look almost identical from the outside. Apple’s coverage and identification resources can use the serial number to provide additional device information. You can also compare the model details with Apple’s official list of iMac models.
If the iMac Will Not Start
Look for identifying information on the computer itself, its original packaging, purchase receipt, or Apple account/device records. Apple documents physical locations where the serial number can be found on Mac hardware.
Do Not Identify an iMac by Screen Size Alone
Apple has sold multiple iMac generations with similar screen sizes and exterior designs. Screen size, color, or case shape can narrow the possibilities, but those details are not as reliable as the model information or serial number.
Why the Exact Model Matters
The exact iMac model can determine which macOS versions it supports, what ports it has, which accessories are compatible, and what repair or upgrade options are available. This is especially important before buying memory, adapters, displays, or replacement parts.
Summary
Start with Apple menu > About This Mac. Record the model information and serial number, then use Apple’s identification resources if you need to distinguish between similar iMac generations.