Restart your computer repeatedly
tapping the f8 key to enter safe mode while the screen is black once in safe
mode where the only things working will be your keyboard and mouse allowing you
to attempt to repair your computer
As the computer is booting repeatadly
press the F8 key as the computer is booting
If done properly the user should
get to a screen similar to the below screen.
Select the option for Safe mode
command prompt only
Windows Advanced Options Menu
Please select an option:
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Start Windows Normally
Return to OS Choices Menu
Use the up and down arrow keys to
move the highlight to your choice.
select safe mode with command prompt
Then type at the C:\> prompt: type
and hit Enter. You'll see a dash (-) at the DEBUG prompt. Now type:
o 70 2e
which will show as -o 70 2e at the DEBUG prompt. Hit Enter. Then type:
o 71 ff
and hit Enter.
and hit Enter one last time to quit DEBUG back to the C:\> prompt.
Now you're ready to reboot your PC, and press the appropriate key or key
combo (look it up in your motherboard manual if you don't know it) to access
your BIOS Setup.
Youll notice the password is gone.
If this fails try typing
command prompt type debug
get a - prompt where you can type the following (<enter> means press
enter, not type enter*)
MOV AX,0 <ENTER>
MOV AX,CX <ENTER>
OUT 70,AL <ENTER>
MOV AX,0 <ENTER>
OUT 71,AL <ENTER>
INC CX <ENTER>
CMP CX,100 <ENTER>
JB 103 <ENTER>
INT 20 <ENTER>
<ENTER> just hit enter on this line
Basic BIOS password
- works 9.9 times out of ten
If this fails you will need to
Select safe mode with networking to download
you could download all of these or just one save them
to a usb drive for later use if one fails to remove the password
At some stage you might need to press Ctrl+Enter
rather than just Enter if on a Dell Latitude E5410
A CMOS BIOS password recovery tool
Editors note: This tool should only be used by
experienced computer users.
Please see the enclosed read me if you would like to
run it from Windows.
Failure to follow
instructions (from Windows) will cause your anti-virus to flag this as a virus.