Lenovo ThinkPad T400 PC Notebook - Page 2 - Answered Questions & Fixed issues

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.

Lenovo ThinkPad... | Answered on Oct 12, 2009 | 165 views

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.

Lenovo ThinkPad... | Answered on Aug 30, 2009 | 1,871 views

Error code 36 means a ley is stuck. Only you can find out which one. Press each key in turn to feel if there is a dodgy key.

Lenovo ThinkPad... | Answered on Oct 09, 2019 | 1,486 views

remove the battery large.
then run on AC pack only
#1 top failure of all mobile PC is that battery, so unplug it
then test with AC pack only.
work now.? and all vents must be clean, end to end. not just fan.
there i no fuse it uses current regulator, imagine genius magic electronics fuses that never blow out, and bingo.

OK big battery out, an RTC coin cell fresh.
then fan blows.
next is BIOS, do the BIOS screens work if not the mobo is dead.
have 2 RAM stick on the 2 slots>? try one at a time
run the PC with all modules removed, (options)
remove hdd?
remove, dvd drive.
think like this. Get bios working first
learn that modules can short, and when they do the power regs shut down.
so we unplug all things to the mob,
until only 1 ram and cpu remains.
see? (this is called power overload fault isolation tactics)
even the screen only can be dead, you never mention text showing
you can test the mobo with external screen via that rear (?)_ VGA jack what if that worked, did you learn something here, sure.
this pc has tons of modules to pull, even bluetooth. wifi, sound and more. if you look at all parts inside or sold by ebay, bingo. lots

Lenovo ThinkPad... | Answered on Aug 14, 2018 | 61 views

Vista is obsolete!

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  • Lenovo ThinkPad... | Answered on Jul 15, 2019 | 1,226 views

    do a system search

    Lenovo ThinkPad... | Answered on Oct 09, 2016 | 34 views

    Press Ctrl and PrntScr together. That will grab the screen then open your document programme, (Open Office, Word or whatever you use to compile letters etc) press Ctrl and V.

    Lenovo ThinkPad... | Answered on May 23, 2016 | 49 views

    It is printed on your invoice/receipt after purchasing it.

    Lenovo ThinkPad... | Answered on Jan 16, 2016 | 50 views

    Just press "delete" "F2" or "Escape" keys imediately then you power on your computer. (Key depends on your pc model)

    Lenovo ThinkPad... | Answered on Jan 08, 2016 | 36 views

    Try this http://www.wikihow.com/Clear-BIOS-Password

    Lenovo ThinkPad... | Answered on Jan 08, 2016 | 56 views

    Do you mean it will move with a mouse, but not the touchpad? If so, maybe settings in this article will help:


    Lenovo ThinkPad... | Answered on Nov 26, 2015 | 65 views

    Make and model of laptop please.

    Lenovo ThinkPad... | Answered on Nov 26, 2015 | 59 views

    Battery recall - Lenovo Support (US)


    LenovoJul 9, 2015 - These batteries were manufactured for use with ThinkPad notebook ...batteries with new notebook computers or as optional or replacement batteries on the... Which ThinkPad notebook PC models are affected by the recall?

    Remove the battery pack - Lenovo Support


    LenovoJun 17, 2014 - Install charged battery; Slide the battery latches to the locked position. Slide the battery latches; Turn the computer over again. Connect the AC ...

    Lenovo ThinkPad... | Answered on Nov 20, 2015 | 94 views

    Go to the BIOS and cancel it. The code was caused by tampering with the laptop.

    Lenovo ThinkPad... | Answered on Nov 07, 2015 | 81 views

    Remove the battery from the ThinkPad and press and hold the power on button for approx 5 seconds. Replace battery and then try again.

    Lenovo ThinkPad... | Answered on Sep 07, 2015 | 38 views

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