Hello, The monitor on my Presario 7478 comes on but, mostly has B/W "blocks" or other strange figures. The windows logo comes on, faintly behind the strange stuff, for about 40 seconds then goes off. Sometimes after 10 or 15 minutes I get a message "IT IS NOW SAFE TO TURN OFF YOUR COMPUTER" The monitor works fine on another system and another monitor does the same thing on the Presario. I tried shutting down system and disconnected the power. I'm not sure where the video card is for this model or if that is even the problem. Help!!