First thing you do to power your laptop on again try removing the battery and the charger complitly leave it for 10 sec without power then press the on off switch for 2 or 3 times without puting the power or batery later try not to put the battery and put only the power adapter and start your laptop dose it starts if yes good shut it down and put the batery in and start the laptop if its starting and leave it running for cuppul of hours and then again remove the power adapter and let it run the system with batery power if it stays on and fine you are ok and fine there was just a power dump but if it fails in any case like fails to boot with power adapter and so you have adapter issue need to be checked if dosent work with batery it self its a batery issue and needs replacement .
regarding the keyboard issue you can open the kay board and clean it with contact spray if posible.
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