I am thinking about sending off my Early 08 MBP as it is having tons of graphics issues with the DVI port (screen tracking, etc.) ... I am wondering - Do I have to put in the factory/stock 2gb ram that came with the computer or can i leave in the 2x2g sticks I bought and put in myself? If they have to replace the machine (unlikely) will they take my ram out and put it in the new machine?