Hi. Best bet is to remove the hard drive adn memory if possibl by removing the panels underneath your laptop. Connect the AC and see if it powers. Remember the new AC should have the same voltage as the old one. see if there are any lights. If no lights to laptop, and doesnt power, then it will most likely be the motherboard. See how it goes after trying these things. Sometimes, certain parts can prevent laptops from powering up
Kash, March 2008