1. Turn on the Dell computer.
2. At the Dell logo screen, press the F12 key several times to enter the 'One-time Boot Menu'.
3. Use the arrow keys to select Diagnostics and press the Enter key on the keyboard.
4. Follow the on-screen prompts and respond appropriately to complete the diagnostics.
5. If the test passes, the hardware devices are working correctly.
6. If the test fails, write down any error codes and validation codes.

<aside> 📶 Please note that these diagnostic tests must be run offline, as they will test the internal hardware of your device.

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For more information, see Dell's help article here: dell.com/support/kbdoc/en-uk/000179493/dell-diagnostic-tools-to-diagnose-and-fix-hardware-problems-on-your-dell-pc-tablet-or-servers