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.
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