I've just trying to look at the same thing trying to see if there is anything that needs replacing!
After 3 years the screen started turned on then would go off 1st to a very dark grey, then after repeated booting up attempts when it went off it was black. Now it doesn't even turn on. Checked out graphics cards and ram were seated correctly, but this was not a problem and the computer is running OK so problem is the VDU.
Look forward to hearing if you find a way in!
Cheers
David Amersham
January 2010