To enter the BIOS on a Windows 10 PC, the easiest and most reliable method is to hold down the Shift key on your keyboard while selecting Restart from the Start menu's power options. This will reboot your computer into a blue screen menu where you can select Troubleshoot, then Advanced options, followed by UEFI Firmware Settings. Clicking Restart here will take you directly into the BIOS setup. Alternatively, if your PC boots fast and you miss the key press, you can also enter the BIOS by pressing the designated BIOS access key (often F2, F10, DEL, or ESC) immediately after powering on your PC. This key varies by manufacturer and is sometimes shown briefly on the startup screen. Summary of common methods:

• Hold Shift while clicking Restart → Troubleshoot → Advanced options → UEFI Firmware Settings → Restart into BIOS.
• Press BIOS key (F2, DEL, ESC, F10) during initial boot before Windows starts.
• Use Windows Settings → Update & Security → Recovery → Advanced startup → Restart now → Troubleshoot → Advanced options → UEFI Firmware Settings.

Ensure to save any work before attempting the restart for BIOS entry as it will reboot the system.