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
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.
Also: here is a list of known bios password that According to reports worked for many laptop:
Award BIOS backdoor passwords:
ALFAROME BIOSTAR KDD ZAAADA
ALLy CONCAT Lkwpeter ZBAAACA
aLLy CONDO LKWPETER ZJAAADC
aLLY Condo PINT 01322222
ALLY d8on pint 589589
aPAf djonet SER 589721
_award HLT SKY_FOX 595595
AWARD_SW J64 SYXZ 598598
AWARD?SW J256 syxz
AWARD SW J262 shift + syxz
AWARD PW j332 TTPTHA
AWKWARD j322
awkward
AMI BIOS Backdoor Passwords:
AMI BIOS PASSWORD HEWITT RAND
AMI?SW AMI_SW LKWPETER CONDO
Phoenix BIOS Backdoor Passwords:
phoenix PHOENIX CMOS BIOS
Misc. Common Passwords
ALFAROME BIOSTAR biostar biosstar
CMOS cmos LKWPETER lkwpeter
setup SETUP Syxz Wodj
Other BIOS Passwords by Manufacturer
Manufacturer Password
VOBIS & IBM merlin
Dell Dell
Biostar Biostar
Compaq Compaq
Enox xo11nE
Epox central
Freetech Posterie
IWill iwill
Jetway spooml
Packard Bell bell9
QDI QDI
Siemens SKY_FOX
TMC BIGO
Toshiba Toshiba
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