Saw the previous video of man destroying Mac.
but
.
But reminded me of when my PowerBook G4 screen went on the blink. Did some searching and came up with probable cause being blown inverter board.
Found one on ebay - £18. Good result - but fitting?
I found this site
Powerbook 17 Inch Repair Video
Decided it was too much for me (not that brave!) Luckily I have a pal who's quite an electronic/computer boffin. But he took it on and completed the repair in an evening.
Been reading previous posts of problems with screens, hope it helps. Search around the site it may have similar videos for your mac.