my screen for some reason is only displaying vertical colored lines.. its a 640x480 color datalux 10.4 lcd. it still detects a vga signal since when I power on the computer it detects the signal and turns on the backlight. but it only displays these vertical colored lines, reguardless of if the lcd is backlit or not. it used to just be black when off, now these lines reguardless. HELP!!!!!!