Hello friend, last month I had bought new branded dell laptop. The configuration of this laptop is to be as Intel core i7 processor, 500GB hard disk, 4GB DDR3 RAM and the ATI Radeon 2400 graphics card installed on this system. The graphics card presents in this laptop is really helpful to installation of the 3D games on this system. In that time I had installed the portal2 PC game but now it is crashed at valve logo. I need help you to solve this kind of issue.