I have a Compaq Presario r4000 that was dropped. Since then, the right side of the screen has a band of vertical stripes, about 4 inches wide and running from the top to the bottom. I plugged it into my desktop monitor and the picture looked fine, so I figured the screen had to be replaced. I got a new screen with a new video cable and inverter board and installed. I just turned it on to see the same thing happening. What can I do?