: If the shortcut doesn't work, restart and press F2 to enter BIOS. Under Post Behavior or Keyboard , change the "Function Key Behavior" setting. ⌨️ Important Dell System Shortcuts Dell 16 Plus DB16250 Owner's Manual
| Key Combination | Function | Usage Scenario | | :--- | :--- | :--- | | | Diagnostics | Initiates the Dell ePSA (Pre-boot System Assessment) . Use this to test hardware (battery, drive, RAM) if the laptop fails to boot into Windows. | | Fn + B | BIOS Recovery | Used during a failed BIOS update to force the system into BIOS recovery mode. | | Fn + T | Thermal Management | On select G-Series and Alienware models, this toggles thermal modes (Quiet, Balanced, Performance). |