Question about IBM ThinkPad R40 2722 Notebook

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The display screen has turned black

My daughter has an IBM R40 Thinkpad that is over three years old. This morning the disply screen began to dim and is now totally black. Even after re-booting the screen will not come on. I connected my dsktop monitor to it and the computer seems to work fine except for the display. A friend who is a programmer told me by phone it could be, the light bulb (?) for the screen has gone out. He thought it was not a simple task to replace.

Ron<><

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  • restorer Dec 12, 2008

    When I connected the laptop to the desktop monitor, only the desktop monitor would display. I tried to press the F5 key (monitor) without success.



    Ron<><

  • Nicha444 Jan 02, 2009

    An external monitor works fine, but my laptop screen is black. I have tried resetting the monitor port with the function key. I have tried resetting the computer by powering down and taking the battery out. Do I need to replace the LCD display or might there be some other software solution? Is there a technical website that tells how to do this? Mine is a 2005 Thinkpad R40.

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When you connected the external monitor thto the laptop did it display?

If so then you have to reset the monitor port. Hold down the function key and find the FKEY that shows a picture of a monitor. Press that until you get the laptop screen back.

Typical use is:

  • 1 press = external monitor
  • 2 presses = laptop and dual monitor
  • 3 presses = just the laptop screen

Posted on Dec 12, 2008

  • Dan
    Dan Dec 12, 2008

    Did you also press the Function key as well as F5?

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I have a IBM thinkpad i was trying to put The resolution screen big to watch in The proyector now it went black And nothing come to The projector i want to come to The regular standar


try starting in safemode. while the computer is starting press the F8 key to enter advanced startup screen. must be pressed before windows startup screen is displayed

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1 Answer

Wery dim screen. On external VDA display all ok. Bad matrice or its power?


This means your backlight has gone out on your lcd screen. Unfortunately the only way to fix this is to get a replacement LCD screen. It is a fairly easy process to replace the screen, however if you do not feel comfortable doing it you should always consult a professional.

Good Luck,

NOLA Tech

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The display on my ibm thinkpad r40 is black after initial dim ibm screen. External monitor works fine though. This happened immediately after I used my ibm with a projector this morning? Fn F7 does not...


The problem youve discribed does seem to point to your back light has failed on the laptops lcd display, i dont know exactly how this would accure just using a projector though, go into bios again and try loading factory settings.

This problem could also be the inverter if you cant make out even a slight image on the screen.

let me know what happens. thanks

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BIOS password needed , locked out with black screen, padlock in upper left corner of display


This is a security feature to keep a thief from using a stolen computer.
Find your original sales-receipt, to prove that you are the original owner of the ThinkPad, and telephone IBM, and ask them for assistance.

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If the the ram is the problem of your system, there should be a power on light on the system. indicating that some of the component of the system is not working correctly. But since you mentioned there is no light, it is the possibility that the problem is the motherboard itself.

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All modern thinkpads are similar, you start by taking apart keyboard and top cover, then you unscrew hinges and remove screen. Here is some movie:

Thinkpad LCD Removal


Removing Thinkpad 600 Series Display - Part 1

Replacing Thinkpad 600 Series Display - Part 2

IBM ThinkPad R40 -- Fixing the black-out LCD Screen

This is not an easy job, there is risk to cause further damage to your laptop if you do not have enough experience.



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Laptop Screen Dim, Blank Or Black - Notebook LCD Display Monitor ...

Click on the above link/ Follow instructions.....Good Luck.

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Intermitent problem IBM-R40


If I understand you correctly you turned off your laptop and since then have not been about to boot up normally, occasionally getting a blue screen. Typically the blue screen also has some type of error message, can you tell us what that is? You indicate that booting from the CD drive is not possible, is that because you don?t have a working drive? In any case this sounds like a problem with system files or possible a device driver and a CD drive is almost certainly going to be necessary. Let us know the answers to this questions and any other pertinent history relating to this issue and we?ll see if we can help.

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