Click the Options icon, then click Continue. If prompted, enter your password. From the next screen, open Disk Utility, select your main drive (usually called “Macintosh HD”), and click Erase.

Apple users warned of hi-tech Mac malware that steals personal data, goes undetected for months— here’s how to stay safe ...

How to Make Sure Information on Your Old Computer Is Really, Truly Deleted It isn’t as simple as pressing ‘delete’ and emptying the Trash. Here’s a step-by-step guide.