hi i have a problem with my inspiron 1520 one is that it keeps shutting down at times and some times i will get a blue screen and others i will not i have changed the memory to 4mb and still gets the same thing i do some 3d designs and some one told me that i can try to configure the graphic card to a Radeon HD4330 but i dont know if the 1520 can upgrade to this so can someone help