Frank,
Take it to an Apple shop and they might be able restore it for you.
I had an old Air Book give up on me and the boys in the shop fixed it for free under UK lifetime guarantee.
Thanks Jimmy, I took your advice and went to the shop. Guy looked at it, laid his hands on it and like the bible it sprang back to life as if nothing had happened. I ASKED HIM IF HE COULD DO THE SAME ON A DEAD GT40 !