Engadget has published a how-to guide explaining where to find Apple Diagnostics, the built-in tool that helps MacBook owners work out whether hardware faults are behind problems such as unexpected shutdowns, display glitches or a keyboard that stops responding. Unlike a typical settings menu, it is not found within System Settings but is instead accessed during startup, with the exact method depending on whether the machine has an Apple silicon or Intel chip and which version of macOS it is running.

To use it, owners should first check "About This Mac" to identify their chip type, install any pending macOS updates, disconnect unnecessary accessories, and place the laptop on a flat, well-ventilated surface. Apple silicon Macs are booted into Diagnostics by holding the power button then Command and D, while Intel Macs use the D key alone, or Option and D for an online version. The tool tests only internal components, not external accessories or software issues, and a clean result (code ADP000) confirms no hardware fault was found rather than proving nothing at all is wrong; any reference codes returned should be kept for further troubleshooting or an Apple Support conversation.