Contact Dell Tech Support for master password
http://www.fixya.com/support/r3656360-dell_portable_computer_bios_hard_drive
I would recommend connecting an external keyboard to the laptop and seeing if you can access the BIOS pages. It seems the keys are preventing you from doing so. The keyboard could be damaged.
The CMOS battery is on the motherboard of the laptop. If you can access it w/o damaging anything, you could reset the CMOS settings (clearing CMOS) and the password will no longer be valid. Hope this helps.
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