i have a toshiba m45 s169 laptop . My laptop LCD is not working properly -- it is a white ( blank) when I turn it on but sometimes when I move the screen around it would turn black with thin multicolored vertical lines. I have reseated the vid cable on the back, and so far it has not done anything. I want to know what could be causing this? When I plug the laptop to an external monitor, it works fine though so I don't think it's a video card problem. So is it the inverter board etc? Pls help me, thanks.