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电脑已经与我们的生活息息相关，尤其在工作上，更是离不开电脑，我们需要用它来查找和存储资料，解决各式各样的问题，那么，当一台电脑需要换掉之前，我们该注意些什么呢？ If you have decided that you want to sell your old MacBook, so you can upgrade to a new one, you need to make sure that you prepare the laptop for sale. You likely have a lot of files, passwords, and other information stored on the device, and you need to make sure that none of that information will be available to the person who buys your MacBook to decrease the risk of identity theft. Also, the more you clean up the device, the more attractive it is going to be when it comes time to sell it. 1. Back Up Your Files The first thing you need to do is back up all of your files. You can go into OS X to learn how to back up all of your files before you erase them from the device. The last thing you want to do is lose anything important from your laptop. By backing up your files, you can be sure that you will have saved everything that you need, including precious memories such as photos and videos. 2. Sign Out of iTunes The next step is to open iTunes and sign out. You will need to go to the menu bar and click on Account > Authorizations > Deauthorize This Computer. You will be prompted to enter your Apple ID and password. Once you have entered the information, click on Deauthorize. This will completely sign you out of iTunes, and no one will be able to log in under your account. | 
