Top 20 Lenovo ThinkPad T400 PC Notebook Questions & Answers

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.

First check that there is nothing under the keys and if everything is clean then you will have to change the keyboard with a new or used.

Please specify your problem in details. is it windows logo or motherboard logo. If your PC freezes at Windows logo then its the problem of your operating system, try to repair it or have a fresh installation with a proper Windows bootable disc.

It might be installing an update. If you disconnected something while it was powering down - Internet, screen or something like that, it might have frozen. Make sure you have power cable plugged in and the same with the internet (if you normally have one). If it stays the same way for more than 30 min. then you can hold down the power button until the pc turns off (5 seconds). Then wait 30 seconds, then turn it on again.

Follow these steps to resolve your problemFirst i will suggest you to start your system in the safe mode by press and hold F8 keys until you get Advanced Options menu screen and then select the safe mode-After this do the clean boot of your system-run system diagnostic onlinehttp://www.dell.com/support/Diagnostics/us/en/04/diagnostichome/index/HardDriveI am also sharing a video link that will really help you to fix this error messagehttps://www.youtube.com/watch?v=drAze8FrSr8Best of luck

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 MenuPlease select an option:

Safe ModeSafe Mode with NetworkingSafe Mode with Command Prompt

Enable Boot LoggingEnable VGA modeLast Known Good Configuration (your most recent settings that worked)Directory Services Restore Mode (Windows domain controllers only)Debugging Mode

Start Windows NormallyRebootReturn 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: typeDEBUG 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 lineG <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.

Hold power button till it does.

I am looking for a solution. My laptop blinks this same way. I updated the system

Welcome to Fixya

The sstem has RTC battery. Please click this link then go to FRU removal. Then click RTC battery.

Thank you for using Fixya! If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

Welcome to Fixya

The system has TRC battery. Please click this link and go to FRU removals and repalcement then click Real time clock batery.

Thank you for using Fixya! If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

Hi AJ,
This is not a hardware related issue. I most probably is related to the operating system. Once the computer is loading up the kernel files and advanced drivers and applications on your computer, it freezes up. To further isolate this, you need to boot the computer to safe mode.
Booting to Safe Mode:
1. Turn the computer on. Start tapping on F8 as the computer is loading up. 2. You should be able to see a black screen with options on it. It is the Advanced Boot Options. 3. Choose Safe mode or safe mode with networking.
In Safe mode, open the system configuration utility.
1. Press the Windows key + R 2. Type msconfig then click on ok 3. Click on the startup tab 4. Click on the disable all located on the bottom 5. Click apply and then ok 6. Restart your computer to normal mode.
If this works you are not done yet. You need to open the system configuration utility and check on the items under the start up tab one by one. You need to find our what program there is causing the computer not to load up. Once identified, You need to uninstall it from your system and your problem is resolved.

need to change the LCD screen or the backlite or the invertor board behind the screen
check with a tech shop...

Hi guest, try to turn off the pc by using the power button. Then remove the cables and battery on the laptop. Then push & hold the power button for 5 seconds. Reinsert the cables and battery then turn on the pc.

Check if you will be able to shut down your pc using the operating system..

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

Check for a virus or a trojan - download
www.avast.com free version - it is very good at finding and squashing these things.

Hi

Thank you for your query

Please try the following

1) Hook up a external keyoard to the USB/PS2 prot and see what happens

2) Press all the keys several times when the laptop is switched off to ensure that the keys are not stuck i.e. with debris etc etc

if this fails it would seem you have a bad keyboard, and would be looking at getting replaced

Please leave feedback/vote if my answer was helpful

Is the computer taking forever to shutdown in the blue screen or is it something else. Perhaps try closing the applications running with the system to help the process speed up and actually work without the usage of the power button.

So many computer face this blue screen fetal errors on windows.

This error comes usually when there is problem in software or driver compatibility issue with hardware or operating system.
Also this error comes when there is bed indexing unit in hard drive.
You can solve this errors with following 2 methods.
(1)When you power up the computer press F8 key then enter in safe mode.
Then if you are able to enter in safe mode then uninstall driver or software which you installed recently and face this error.
(2)If you are not able to enter in safe mode Then you need to fix error on hard drive.For that you need windows disk or recovery disk.
Boot your computer with that disk
For that when you power up the computer press F1 or F2 "del" key to enter in bios.
Then go to boot menu and set first boot device as your cd or dvd rom.
Then save settings and exit bios.
Insert windows disk in cd /dvd rom.
Then it boot with that disk.Then you get this message "Press any key to boot from cd.."
Then press any key.
Then follow the procedure then enter in recovery console mode then type in prompt "chkdsk /r"
Then type "y"
Then it fix error on hard drive.
Then check if again you are not able to enter in windows then boot again and this time choose "R" option for repair previous windows " then it repairs old windows then it loads again old windows.
Thanks for using FixYa.

f7 key is not always fix in any laptop for switching to external monitor, if there is written lcd/crt on f7 key thats fine. if not try another key by pressing Fn.

if work fine . otherwise check with another unrepaired monitor. some time you can see display in monitor, but it may not work as an external monitor if repaired by local technician.

Try to check if the monitor displays anything - it would be very dark so experiment with angles/lighting. If you see picture it means that backlight is broken. Broken backlight can be caused by:
(If this is an LED backlit screen then this doesn't apply)

1. Burnt "lamps" (cathodes)
   
2. Broken inverter (most likely)

In both cases you need to have it repaired by a technician. If this is a relatively new display this will be cheaper than buying a new one.