Ok so, my laptop was working fine the last time i shut down. I went to turn it on, and nothing happened. so i plugged it in, and still no. the power adapter is good, it runs my friend's computer. when i plug it into mine, there are no lights or anything. i have not been having any trouble turning it on. there aren't any loose connectors that i know of. could it be a small part, do i have to replace the whole motherboard or what? thanks, dan