I just read your first post, and if it works sometimes then it looks like either the screen itself, or the backlight inverter. Just to let you know what you are getting into take a look at the links below.

https://www.youtube.com/watch?v=ucaJA324hbg
http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

It isn't just the work involved, as it could be at least three different faults, you have to decide which, and then source the replacement parts. This means valuable time on the internet when you could be making music. Even when you think you have the right parts, they are probably for an earlier model and they changed the connectors. I had to solder the old connectors on the new backlight because they changed the angle. But getting everything back together is the real test, and those backlights will snap if you just look at them wrong. Imagine a neon tube 4mm in diameter!!

If you have the space, an external monitor is the way to go.

Chris