There could be two possible faults that could cause a problem like this:
First it could a short on the motherboard at the power supply connecter, which to repair would consist of taking the motherboard out of the laptop, and maybe replacing the power supply socket. It could also be a faulty componant on the motherboards power supply circuitry.
Second it could be the power supply itself, the only way to test this is to aquire a new power supply, you could take the laptop and power supply to your local pc store, explain the problem to them and ask if they could test it with a new power supply, if it works with the new power supply then you can buy it, if it dosent then you know the problem is with the motherboard. hope this helps and please post back the results, thanks.
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So, when the laptop is connected to the AC adapter to an electrical outlet, the laptop shuts down? And, when the laptop is using the battery, it does not? What happens if you take the battery out of the laptop and plug in the laptop with the AC adapter? Initially, I would think there is a problem with the AC adapter.
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