If the F12 key is not working, you may need to enter the BIOS first using and ensure the F12 Boot Menu option is set to "Enabled" under the Main or Advanced tab.
If you are staring at a black screen, frantically pressing keys, this guide is for you. We will cover everything you need to know about the , including the specific key combinations for different models, how to access the BIOS/UEFI, and how to troubleshoot boot issues. dynabook laptop boot menu key