Our son's HP Omnibook xe4400s has developed a video problem. When it powers-up the display brightens momentarily then fades down to the lower left corner and remains dimly lit. Once it has completed booting (no text or graphics are ever visible during the boot process) if I press certain keys, e.g. Ctrl & Alt (I'm not sure it matters which I press) I will see lots of multi-colored vertical lines on the display. If I press Alt-F1 and use the arrow keys up and down I can see changes to the vertical lines (but never any discernible text or graphics). Do I take it that this ia a failure of the video section? I did check that the video cable was properly seated and tried tapping various locations on the lid and body - no evidence of a mechanical intermittent. Is the video section a separate sub-board, as in the Toshiba Tecra TE-2100, or is it embedded in the motherboard - requiring the replacement of the motherboard? Thanks!