It looks like a RAM problem. I assume you have 2 sticks. Take one stick out and try again. If that does not work, try the other stick by itself. Here is a guide on how to do that ( http://support.gateway.com/s/Mobile/Gateway/4536GZ/4201faq25.shtml ). This may not be exactly your model, but you will get the idea. The important step is opening the clips. The rest is a piece of cake. If you determine that it is a faulty stick, get a new one (you may use the opportunity to upgrade your RAM). You can scan your PC here ( http://www.crucial.com/index.aspx?gclid=clc7ieyzvpccfryenaodgh7jsw&ef_id=1705:3:s_6bb7793def0e1a58cd2af23d4db33704_1771685393:pyvl99bklaoaac96jqyaaaap:20081213201317 ). The Crucial System Scanner Tool will tell you what options you have - and the price. But it never hurts to shop around.