- 1). Examine the chassis. First-generation iMacs will be a solid color--blue, green, yellow, red or purple. According to Apple-History.com, their CPU speeds ranged from 233 MHz to 333 MHz. If the chassis has a floral or spotted print, its CPU speed ranges from 400 MHz to 600 MHz, and it may contain a writable CD drive. White or indigo iMacs may also have writable drives and can be as fast as 700 MHz.
- 2). Locate the CD drive below the screen. Early models have a pop-out tray. These drives cannot burn CDs. Newer models have a slot into which you feed the CD. These models contain CPUs ranging in speed from 350 MHz to 700 MHz, and may have burnable drives.
- 3). Look at the screen. If it is a flat panel attached to a dome-shaped base, it is a second-generation iMac. Its CPU operates between 700 MHz and 1.25 GHz. Third-generation and Intel-based iMacs consist of a flat-panel screen attached to a flat stand. These operate at speeds from 1.6 GHz to 3.6 GHz, according to Apple as of 2010.
- 4). Examine the underside of your iMac for a label containing a four-digit "EMC" number. Visit the Resource link to look up your model by EMC number. If you cannot find your EMC number, proceed with the following steps.
- 5). Click the Apple icon in the upper left corner of your screen and choose "About this Mac" from the menu items.
- 6). Select "More Info." This opens your System Profiler. The profiler's left window has menu options. The right window displays information about the selected item.
- 7). Click "Hardware" from the menu on the left. The window on the right will display system information under the heading "Hardware Overview." Here, you will find your Mac's model number.
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