Hi so my Macbook (Late 2008 version) wont turn on, I was using it and the screen suddenly went dark. I've tried all the methods that are on all the forums like every single one so now I'm stumped, any ideas?

Every method out there I've tried and none of them work, for my course in uni my laptop is essential (plus ive had it for so long its practically my baby). If i shine a torch light on it the images can be seen, and everything else works fine the startup sounds are normal, ive been playing music from it but its just a nucianse to always have to navigate using a torch light and there is no way i could type an essay like that.

Does anyone have any idea what is wrong with it, and/or how much ti would be to get it fixed by Apple in the UK (it is no longer under warranty)