I just bought a iMac G5 and it has the infamous graphics card issue. Right now it has only small faint cyan dashed lines across the display and i was wondering if they could get worse or make the computer to stop working as right now it isn't really bothering me and i can live with it. Im not sure if i should return it or not. Its the 1.9 GHz with the ATI Radeon X600 Pro card.