Display turns dark, Icons remain dimly visible

Regards, ... I have the Macbook A1181 for two years.

It turns on normally, but within 5 seconds goes to black screen. (the other functions are operational ) If I light up the screen with a lantern, I can distinguish the icons on the screen. Fans function-- normal temperature, no noise but only allows me to recover some of the image when I reduce the brightness and gradually increase to 2 or 3 points light. When I get up to 5 or 6 the screen turns black again.

I've worked with Logic until last week but occasionally had to pause due to temperature increase---could this be one cause ?

When I try to play a movie does not even allow two points of view it with brilliance.

Any suggestions?.

Thanks for this site and greetings to all, see you soon.

Nacho.