Dell e6400 bios reset

Take out the RTC battery (Lithium CR 2032) on the motherboard and leave it out for 10 minutes (10 minutes). Then re-install the RTC battery. Re-start the computer. This will reset the BIOS to factory defaults.

(For the location and 'how-to' details, download the manuals from "support.dell.com" by entering the service tag number).