The manual says BIOS can be navigated with either keyboard or mouse. So have you tried using the mouse on the right side?
You may want to try resetting BIOS to the defaults to see if that solves the problem. Copy down all or as many of the current settings first, just to be safe. Then press <alt><F> or see if you can navigate to the Defaults Menu to do it.
If you can't load defaults that way, you may have to remove the motherboard battery:
Power off and unplug
Press/hold power button for ~15 sec
Open case and remove battery
Press/hold power button for ~30 sec
Reinstall battery - might be time for a new one if this one is old
Close up and boot into BIOS
Assuming you can navigate now, make sure all settings match what you copied or change to match. Be sure to save any changes before exiting setup.
Forum Member since 2004
I am not a Dell employee