I have Sony laptop VGN FE550G
The screen had a slight flickering problem that would go away after the computer was on for several minutes.
Now the screen will flash an image upon start up and then go blank. I use the super video output and can have normal output to a TV. If i use the switching key from TV to LCD an image will flash on computer LCD screen and go away. The image is consistent and stable when displayed on TV,
I have the most current video card driver installed for the intel 945 chipset family.

Heya!
If the screen looks fine on the external then it could be the inverter card.
If not then your video RAM must be faulty.