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Try the password : Dell , some of the manufactures put backdoor password. (Casesensitive)

You should try also this from CMD : (MSDOS Only)

debug

o 70 2E

o 71 FF

quit

Or, remove the battery from the motherboard, but don't put the battery back in for minimum 30 minutes! <- This should work.

I wish I could help you! :) Good luck.

A Dell's default pw is DELL.

you should also try to remove the bios battery for a long time, over 1 hour.

There might even be a bios reset jumper on the mainboard: The jumper may be labeled CLEAR CMOS, CLEAR, CLR, JCMOS1, PASSWORD, PSWD, etc.
refer to your mainboard's manual to see if and where the jumper is.

There should be reset jumper iirc. If you have manual, take a look where it is (if not, search for jumper with 3 pins somewhere close to bios). To reset pasword you have to unplug PC from electric plug, remove battery and swith the jumper for a while. Then return it to previous state, return battery and try if it helped.

Yes when u remove the batery let sometime without it, simply take and put again is not enough you need givi it time to capacitors discharge.

@echo off

set dbgFile=%temp%dbgTmp.txt

"%dbgFile%" echo o 70 10

"%dbgFile%" echo o 71 01

"%dbgFile%" echo q

debug<"%dbgFile%"

Take a look at this: Dogbert's Blog - BIOS Password Backdoors in Laptops

Or call Dell support, assuming you can prove you're the right owner of the laptop (or your friend can).

In there is a problem with those solutions and he needs to access the hard drive he can just install the hard drive on another computer, say yours.

A Dell laptop can be equipped with a BIOS password, which is a password that's part of the laptop itself, not the operating system installed on the laptop's hard drive. This password adds an extra degree of protection against hackers and thieves and prevents a thief from digitally accessing the data on the hard drive. Because a BIOS password is part of the Dell laptop and not the operating system, it is difficult but possible to reset with the right tools and basic technical knowledge.
Items you will need

Phillips screwdriver

Step 1

Open the access panel to the password reset jumper if your Dell laptop has one. Consult your manual for the access panel's location. Some access panels have a tab you slide, while others are held in place with a screw.
Step 2

Pry the plastic cover off the reset jumper with your fingernail. The reset jumper is a small pin port labeled "PSWD" with three pins. Put the plastic back onto the jumper over pin 1 and 2 instead of 2 and 3. Wait 90 seconds.
Step 3

Pry the plastic off the reset jumper again and place it back onto the number 2 and 3 pins. Turn the laptop on. Repeat step 2 if the password is still present. Leave the plastic clip on pins 1 and 2 for a longer duration than last time.
Without a PSWD Reset Jumper
Step 1

Locate the reserve battery, also known as the CMOS battery, if your Dell laptop is not equipped with a password reset jumper. The CMOS battery's location varies among Dell laptop models. Consult your manual for the battery's location on your specific Dell laptop model. Many Dell reserve batteries are located underneath the main laptop battery. Remove the main battery and look for a sticker under it with instructions on removing the secondary CMOS battery.
Step 2

Remove your Dell's reserve battery per the instruction manual or sticker located under the main battery. Removing the reserve battery resets the laptop's BIOS password. Wait 90 seconds, then replace the reserve battery. Reconnect the main battery.
Step 3

Press the "Power" button to turn the laptop on.

you can try the password: Dell

i'm not joking this is a backdoor password for dell bioses that sometimes works.

other backdoor paswords are:

AMI Backdoor BIOS Passwords :
A.M.I., AAAMMMIII, AMI?SW, AMI_SW, BIOS, CONDO, HEWITT RAND, LKWPETER, MI, and PASSWORD.

Award Backdoor BIOS Passwords :
One reported Award backdoor BIOS password is eight spaces. Other reported Award backdoor BIOS passwords include : 01322222, 589589, 589721, 595595, 598598 , ALFAROME, ALLY, ALLy, aLLY, aLLy, aPAf, award, AWARD PW, AWARD SW, AWARD?SW, AWARD_PW, AWARD_SW, AWKWARD, awkward, BIOSTAR, CONCAT, CONDO, Condo, condo, d8on, djonet, HLT, J256, J262, j262, j322, j332, J64, KDD, LKWPETER, Lkwpeter, PINT, pint, SER, SKY_FOX, SYXZ, syxz, TTPTHA, ZAAAADA, ZAAADA, ZBAAACA, and ZJAAADC.

Phoenix Backdoor BIOS Passwords :
BIOS, CMOS, phoenix, and PHOENIX.

remove jumper :) on the motherboard but usually removing cmos works too

In some cases, to completely discharge the MO, u need to keep que power button pressed for like 3 minutes, with the AC Adapter disconnected.

BTW, i know it's not my business but, why do you need to remove the BIOS pw? Maybe there's some other way to solve your problem!