Gateway laptop screen flashes, external monitor ok

[Davsmith]

Gateway W7 32bit laptop screen flashes redish signal then turns black, I see screen signal with lamp. External monitor works good. I think the backlight is bad, but why does it flash?

 

[jarotech]

Hi, something is at the end of his life, maybe the inverter is dying, if you have one, or the backlight for the screen.