PCG-791M - LCD does not light up

[cavanr]

Hi. I have a Sony Vaio laptop. The screen doesnt come on but the lights on the front do. Any ideas. Ive been told its possibly motherboard, how much are they to replace. Can I also check if it is in warranty? I did not buy from a dealer

[kee-lo_]

Try plugging in a monitor? Do you see a picture on there?
If you do then it's more than likely your inverter which has gone kaput

[cavanr]

thanks for the reply. Tried that but no good, but wasnt sure if it was coming on or not. Tried pressing the f8 key (I think it was that f number) to switch between laptop and plugged in monitor but no good
??

[rich912]

Tried pressing the f8 key

Did you try Fn + F7?

[cavanr]

thats what I meant, yes tried that
?????

[kee-lo_]

Sounds like a graphics card failure

[gigierk]

Tried pressing the f8 key
 
Did you try Fn + F7?

Have you perssed the left or right arrow key afer the Fn+F7 key?

[cavanr]

No, I think I have pressed just about every other key