Well Laptops generally have a removable panel on the bottom that when its removed exposes the RAM, Hardrive, and Wireless Card. The RAM itself looks like two shortened regular sticks of RAM, first check too see if they're properly seated, I tried to turn on a computer who's RAM wasn't seated and nothing happened, same as you, if they are seated properly, try what Bill2 mentioned and leave one in and swap it with the other one too see if something happens, and if that doesn't work, then maybe it's just overheated and won't start at all until it cools.