1. It's possible the AC adapter died while you were working on the laptop. The laptop was running until you had charge in the battery and after that it turned off. Can you test the AC adapter? Make sure it outputs correct voltage.
2. It's possible that you have bad RAM module. Do you know if you have two RAM modules installed in your laptop? Try removing them one by one. If one of the modules is bad, the laptop should start when your remove it.
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