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BIOS, diagnostics and other start-up notes

You can also run the built-in diagnostics in case of a hardware crash

Crashed computer

You can try the standard hard reset trick

More details in:

Power off the machine, then power it on again and press repeatedly the appropriate key several times while the computer is starting

Dell	`F2`
HP	`ESC`

Settings ⇒ General ⇒ Boot Sequence: USB Storage Device must be selected, and in the first place of the Boot Order

Dell:
- Healthy Windows computer: check the support page
- Crashed Windows, or healthy (or crashed) Linux computer: use a USB key to update the BIOS, following the steps in the How to recover from booting issues using the BIOS Recovery Tool video
HP:

If the BIOS update does not seem to work (no update takes place), check this HP BIOS update section

Dell	`F12` (enter the One-time Boot Menu)
HP	`ESC` and then `F2`

Safe mode ⇔ Mode sans échec

Power off the machine, then power it and press the appropriate key at the same time

Dell	`F8`
HP