You cannot bypass the password security feature on a Dell, you have to contact their support team and give them the service tag off the bottom of the case.
Viewing Existing Asset Tag and Service Tag
- Boot the computer using a bootable floppy disk or CD.
- Type cd c:\Dell\Util and press <Enter>.
- Type asset and press <Enter>.
The only thing I can suggest if you want to try it.....remove the RTC (CMOS) battery for approx. 30 minutes. Re-attach the RTC battery, take out the main laptop battery and set it aside. Now, power up the laptop using just the AC adapter. Boot the laptop upand see if the password is cleared out. The laptop may still ask you for a password, just hit enter and see if that clears it off. If it does, get into the bios by striking F2 when you see the Dell splash screen and reset the time and date. power off the computer and reattach the main battery. reboot
The other option is to "short" the two contacts of the RTC battery until the laptop does its initial post. This can be done two ways, if your RTC battery is attached to the motherboard by a small cable, remove the battery and look at the socket the plug fit into. take a small wire and "bridge" the two contacts in the plug, this will "short" the connection and cause an immediate reset during POST. If your battery sits ina flat socket by itself, then remove the battery and short the two metal battery contacts inside the battery socket. Power the laptop up with this "short" in place until the laptop POSTS or for approx. 2 minutes until you are sure that POST has happened...just iin case you have your laptop torn apart and can't see a screen. Once this has happened, remove the "short" and put the system back together...again, it may still put the password test box up, just hit enter and see if it bypasses it.
You RTC battery is in a small compartment inside the main battery compartment, remoce the main battery and you will see a small access door on the side wall, the battery is in there.