Here is the list of Laptop and Desktop System Boot Codes for various brands:

 

Acer

F2 (BIOS Setup)

ALT + F2 (Boot Device Options)

F12 (Boot Device Options)

ALT + F10 (Acer eRecovery)

 

ASUS

ESC (Boot Selection Menu)

F2 (BIOS Setup)

F9 (Asus Laptop Recovery)

 

Apple

Command + Option + P + R (PRAM and NVRAM Reset)

Command + S (Boot into Single-User Mode)

Command + V (Boot with Verbose Status)

Option (Select Hard Drive Boot Volume)

Option + N (Boot Image from Netboot Server)

Shift (Boot into Safe Mode)

C (Boot from CD Drive)

D (Boot from OS/X Recovery and perform Hardware Test)

N (Boot from Network)

 

Dell

CTRL + F11 (Dell™ PC Restore by Symantec)

F8 (Repair Your Computer) Dell Factory Image Restore

 

HP

F10 (HP Recovery)

HP Pavilion Laptops

ESC (Startup Menu)

F1 (System Information)

F2 (System Diagnostic)

F9 (Boot Device Options)

F10 (BIOS Setup)

F11 (System Recovery)

 

IBM ThinkPad

F11 (IBM Product Recovery)

 

Intel NUC

F2 (System Setup)

F7 (BIOS Update)

F10 (Boot Menu)

 

Lenovo

LenovoOneKey Button (Lenovo OneKey Rescue System)

F2 (BIOS Setup)

 

Sony Vaio

F10 (VAIO Recovery Wizard)

 

Toshiba

0 (zero) (Toshiba Harddrive Recovery Utility)

F2 (Setup Utility)

F8 (Advanced Boot Options Menu)

F12 (Boot Menu)