Having problems with your IBM ThinkPad T40 2373 Notebook ?

My ibm thinkpad T40 powers on but does not post. No hard drive activity blank screen. But it was working fine 1 hour ago. Before this happen I was working in windows and the computer hung up. Then I rebooted and now get nothing but power lights. What could be the problem?


Answers :

Hi.

Try first disconnecting the power adapter, removing battery, waiting two minutes, and putting the laptop back together.
That will drain power from main board (apart coin battery powering BIOS and some other circuit). This can fix some minor problem that can cause no start.

If that does not work , then there is a fault. In that case you have three possibilities.

1) Computer is completely dead, no power, dark screen.

If the screen is dark, and there is no power at all, then test the power adapter. Reading volt on adapter DC connector you must have a voltage within half volt from specs written on adapter.

Try also starting the laptop with adapter only and no battery. If the battery has an internal short, it may cause the laptop not starting.

The DC socket where you plug in the adapter is also a common fault causing complete death. To fix that problem the thinkpad must be taken apart completely. The socket must be re-soldered on top of the motherboard.

A faulty motherboard can still cause no power. Usually when it is the motherboard you get leds coming on.


2) If the laptop will start with lights, but screen is dark.

The inverter is a common fault causing this. The inverter is the high voltage board that supplies AC voltage to backlight system. When the inverter is faulty you will get no picture. When problem is the inverter, the disk is usually coming on.

The graphic adapter or other circuit on motherboard may cause the same state. When the motherboard is faulty you usually get leds and noise from drive units.

3) Laptop has power, but it is not functional with blank screen with backlight.

That usually means that the motherboard is gone. Motherboard gives power to inverter, but does not generate signal.
In that case the drives are starting.
A blank screen with backlight may also be caused by LCD problems, in that case drives will be working and computer will even show POST and boot screens if connected to external monitor.



I think you are in situation one.

Follow indications given, If you still cannot restart the laptop, and adapter has correct voltage, you may need to replace the motherboard.
Ensure that is not just a temporary problem, or a faulty power adapter first.

Regards.
Open back cover and pull battery then refix RAM memory.
Then check.
When you power up press F1 or F2 or del key so you see bios screen.
Load optimal defaults settings disable SATA then save settings and exit.
If you can't get any display still then you need remove whole back cover of laptop then pull cmos cell from mother board for 10 minutes then check.
Let me know if you need further assistance.
Thanks for using FixYa.
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