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I drop water on my laptop hp 15-bc300ng, and it seems totally dead. does not work at all. maybe motherboard broken. so could anyone tell me if can I change motherboard or no and just sell other pieces and buy a new one?

shamaa60 download the maintenance manual from here. Page 58 will tell you exactly how to replace it. You will also find a listing of motherboard part numbers based on your system. Armed with that you can do an online search for your geographical area and get a replacement board.