Is the screen in good condition? You can run a web-based tool like LCDTech's dead-pixel checker to look for dead pixels on the screen.Does the keyboard work? Open a text window and test all the keys to make sure they work properly.

Use a USB flash drive, for example, to make sure all the USB ports respond.

Do all the ports work? Test all the ports on the Mac.

Does the Mac start up without an issue? If it's a MacBook, can you boot it from both AC power and the battery?.

Here are few of the operational aspects of a used Mac you'll want to check out before purchasing it. Minor cosmetic blemishes are no big deal, but if the battery doesn't hold a charge, that might be a dealbreaker. If you can spend some time with the Mac before you buy, there are some simple tests you can run to make sure the computer is in good working order. Test the Mac to make sure it works properly Also, keep in mind that Apple is moving away from Intel processors. As Macs with Intel chips are phased out in favor of Apple's own silicon, your used Intel-based Mac may start to encounter obsolescence sooner than you expect. It's a good idea to not invest in a used Mac that is more than three years old, because Apple tends to support its computers for about six years. For a used Mac to be a good value, you want one that puts that obsolescence date as far in the future as possible. That means it will no longer be supported by Apple, and you won't be able to install OS updates and security patches. Beware of the Mac's impending obsolescenceĮvery Mac, regardless of model or age, will eventually become obsolete. In general, getting a refurbished Mac is a lot safer than buying an unwarranted used computer, and you can find refurbished models at reputable reseller sites and even directly from Apple. There's an enormous market for previously owned Macs out there, and you can buy a used Mac directly from a private owner - or you can get a refurbished model which has the advantage of being inspected, have bad components replaced, certified in good condition and even features warranty coverage.

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