Please disregard everything that I stated below, but I am keeping it for people to see. I was incorrect, and I did not do my research. I’m just a hobbyist trying to break into the community, and sometimes I’m wrong. I apologise for the misinformation, and I hope to learn more so that things like this do not happen again.
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Hello, I looked on Apple's website, and according to it they did not release a 21.5 inch IMac in 2015. To get your model number, click on the apple in the upper right corner, and at the top of that menu, click 'About This Mac'. On the first page, it should say the type and model of your computer. Just edit the question or post it in the comments and I can get an answer for you.
Hello, I looked on Apple's website, and according to it they did not release a 21.5 inch IMac in 2015. To get your model number, click on the apple in the upper right corner, and at the top of that menu, click 'About This Mac'. On the first page, it should say the type and model of your computer. Just edit the question or post it in the comments and I can get an answer for you.