Why does my laptop only work when it is plugged in although it is fully charged?

kalyan raman May 22, 2013
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My laptop (COMPAQ) will shut down as soon as it is unplugged, even though it is fully-charged. And it will not switch on unless it is plugged.

I thought it would be due to overheating and started using an external cooler, but still the same thing is repeated.

Can anyone suggest me to fix this problem?

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