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.
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.