I have a standard ASUS MB with on board sound/display cards.
Recently on boot, my lcd display goes all psycadellic. long coloured vertical lines appear on screen which change when windows is booting.
At first I thought it was a bad connection/cable between the comp and lcd display. This problem only happens occasionally.
The really odd part is that i've found if i wiggle my speaker jack at the back of the comp, the problem goes away!
It's rather annoying.