Question about Lenovo ThinkPad T400 PC Notebook

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Bios password for Lenovo T400

It is locked by bios password and i forgot the password

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  • Lenovo Master
  • 27,725 Answers

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
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)
Debugging Mode

Start Windows Normally
Reboot
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

DEBUG

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. Finally type:

Q

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


At command prompt type debug
you will get a - prompt where you can type the following (<enter> means press enter, not type enter*)

A <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
G <ENTER>
Q <ENTER>

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


http://www.tech-faq.com/reset-bios-password.html


At some stage you might need to press Ctrl+Enter rather than just Enter if on a Dell Latitude E5410


http://majorgeeks.com/CmosPwd_d239.html

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.


Hope this helps.

Posted on Nov 28, 2012

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Posted on Jan 02, 2017

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SOURCE: i am forgot bios password

The only simple way to Erase the forgotten Bios Password is to Reset the CMOS Battery.

Posted on Dec 11, 2010

  • 87 Answers

SOURCE: i am forgot bios password in my lenovo g550

Hi,
Are you the one who set up the BIOS password? If not, unfortunately, there's no way for us to retrieved the password. The only way you can reset the password to default settings is to reseat the CMOS battery on the motherboard, its a circular thing that looks like a battery of a watch,sometimes a pin hold it, just detached it then wait for at least 30 minutes then connect it back again,
Note: Before you reseat the CMOS battery,make sure that everything is unplugged on the computer, like AC adapter,battery and all external devices...
Hope this will help...Your response is very much appreciated...

Posted on Jan 25, 2011

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try taken out your cmos battery some times this will get rid of passwords,its the small round battery on your motherboard.leave it out for a couple of secs then put back in.might work for you,good luck.

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If you're misinterpreting the screen information and it happens to be the bios user password that's forgotten it is possible to have an authorized Lenovo repair center reset it with adequate proof of ownership. Lenovo themselves will not do it. If it's the SVP password for the bios the only solution is to replace the motherboard. Period.

Having passwords that can be reset like in the old days just by jumpering 2 wires defeats the purpose of having a password in the first place.

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remove cmos battery
see
https://www.youtube.com/watch?v=3rwTJZc4xXw
Then at some stage put the battery back in or the settings you put back in won't stay set (not shown on the video is putting the battery back in)
If virus in bios then you will need to reflash the bios
http://smallbusiness.chron.com/cleanse-virus-bios-79706.html
https://www.youtube.com/watch?v=7aDsWu71a2A
http://support.lenovo.com/au/en/downloads/migr-70351
https://forums.lenovo.com/t5/Lenovo-U-and-S-Series-Notebooks/LENOVO-BIOS-RECOVERY/td-p/332989

Create also a kaspersky resue disk to boot from to check your hard drive for virus
https://support.kaspersky.com/viruses/rescuedisk

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if your keybad is usb just tray to replace the port of usb or tray to enter in the bios and reseete factory default settings

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dear go to foliwing link and downlod the software wich can help for opening your password

be for do any thing folow the instrucation

http://www.rixler.com/access_password_recovery.htm

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Try to reinstall your coumputer if it dosent work call the company

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Bios leneovo sl 400 Password :-(


BIOS password is a security feature to prevent theft. You will need to replace the system board. If you are the valid owner or not.

Lenovo does not have a reset password. Call their support and they will advise and provide costs and local authorized Lenovo Service Center that can replace the system board for you. Typically costs between $200-700 plus labor.

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HI,
My laptop was locked, I m unable open the open the locked its showing lock simble i m unable entry in bios also.

Please help me

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