Question about IBM ThinkPad T40 2373 Notebook

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When i power it on i get four beeps four times and it won't boot and shows nothing on the screen i.e. dark screen the make is thinkcentre lenovo model and after i decide to shut it down by long pressing power button it shuts down but powers on just like that with anybody starting it therefore i have to remove the power to shutdown.

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1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad.
6. The motherboard could be defective & needs to be replaced.

Posted on Sep 18, 2010

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