Mac How do I run a diagnostic on my Mac? By DIY Posted on September 15, 2022 Turn on your Mac and then immediately press and hold the D key on your keyboard as your Mac starts up. Release when you see a progress bar or you’re asked to choose a language. Related Topics: Most Popular How To How to Record Video on Windows 10 Sateenkaari Kuinka pakotan Macbook Airin sammumaan ilman virtapainiketta? Android How To Remove A Virus From An Android Phone Linux How to Fix: WiFi Connected But No Internet Access Windows Epson Error Code 0x97 How To How to Clean Hacked WordPress site