Whether you're curious about a device you purchased or want to see how well a phone runs before you sell it, here are the best diagnostic tools for iPhone and Android.

How to use Diagnostics to check your Chromebook battery health The first segment you’ll arrive at on exploring the Diagnostics app on your Chromebook is Battery.

How do I run Windows diagnostics on startup? In Windows Search, type msconfig and right-click System Configuration, then select Run as Administrator. In the General tab, select Diagnostic startup.

If your Mac is having problems, macOS has multiple keyboard combinations that you can hold to recover your system, start in safe mode, run diagnostics, and more. Here's how to use them.

When using an iPad, you might notice blue frames appearing around the screen elements. This often happens when Full Keyboard Access is enabled. Full Keyboard Access is an accessibility feature ...