Need help on this.. I received Blink (code 4) which means i have issues with my Graphic Controller.

http://h10025.www1.hp.com/ewfrf/wc/documen...product=4110576

Now does this mean my GC is broken or is it the monitor? If its the GC can i upgrade the GC on this laptop or is the card onboard? Ive seen some vids on youtube on changing the LCD, any idea where i can get one of those LCD?