How reset/reboot a HP Chromebook?

"F5" or "Ctrl+F5"

1. Press Esc + + Power. The screen displays a yellow exclamation point (!).
2. Press Ctrl + D to begin dev mode, then Enter. The screen displays a red exclamation point.
3. Press Ctrl + D. The Chromebook deletes its local data, returning to its initial state. The deletion takes approximately 15 minutes.
4. When the transaction completes, press the spacebar, then press Enter to return to verified mode.

This comes from Googles support page

Wipe device data

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The BIOS information is typically found at or near the top of the POST screen for a very short time ALR PC non / PCI = CTRL+ALT+ESC AMD advanced micro devices=BIOS = DEL Award BIOS = DEL Dtk Datatech Enterprises Co. BIOS = ESC Phoenix BIOS = CTRL+ALT+S Phoenix BIOS = CTRL+ALT+INS Restart your computer during the boot process you will see on the screen to press a certain key usually Delete or F2 to enter setup
this will differ depending on which bios you have Press and hold that key during the boot up process to enter BIOS if you have changed any of the BIOS settings by mistake you can load failsafe or optimised defaults using the arrow keys you can after you make any changes in BIOS press Esc then press the F10 button save to cmos to restart CMOS is an on-board semiconductor chip powered by a CMOS battery inside computers that stores information such as the system time and date and the system hardware settings for your computer.. this will reset your cmos

hi there,

On most systems, the key or key combination to press to enter the BIOS program is displayed on the screen when the system boots up, at the time when the BIOS is ready to enter Setup.

take a look at some default keys:-

• {Delete} (modern Award and AMI BIOSes)
• {F2} (modern Phoenix BIOSes)
• {Ctrl}+{Alt}+{Esc}
• {Ctrl}+{Esc}
• {Alt}+{Esc}
• {Ctrl}+{Alt}+{S}
• {Insert}
• {F1}