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 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.

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.

Windows 11/10 users can use the inbuilt Windows Boot Performance Diagnostics to detect Windows Boot Performance problems and attempt to determine their root causes.