how to erase mac before sending in for repair

Disconnect everything except the power and the keyboard and mouse (if external), and now restart. Persistent blue or grey screens when you boot up your Mac tend to be caused by a peripheral. The Mac doesn't start, but hangs at a blue or grey screen However, if you can’t perform this repair because Disk Utility just isn’t seeing your startup disk, you might have to take it to a Mac expert to get serviced. If Disk Utility did not find or could not repair all the errors, you might have to reformat the disk, reinstall the macOS or restore a backup using the Time Machine. This should prompt your Mac to find errors and repair them.

Step 3: Select Disk Utility, press continue and find your startup disk in the sidebar. Step 2: Turn on your Mac, and hold Command (⌘) + R. Step 1: Press and hold the power button for 10 seconds to turn your Mac off. As long as it’s not a hard drive that’s stopped working completely, there might be a way to get your Mac back to the way it was. It’s a scary thing, turning on your Mac only to find a solitary folder with a question mark on a solid black background. If your Mac starts up to a Mac folder with question mark, it could mean one of two things: (1) your startup disk is no longer working because either you previously started your Mac from a different disk or your hard drive has failed, or (2) there’s no working operating system installed. Mac folder with question mark: what does it mean?

How to erase mac before sending in for repair