Display light comes on, screen stays black: 17" blue & white G3

When the machine starts up, the green display light comes on as usual, but the display doesn't. Doesn't display, that is: stays black. I can hear everything starting up as usual, even the little fuzzy click sound of the display coming on. So it seems to be alive, but not as healthy as I would like!
Anyone know what the problem is and how to fix it?

Try using the resetting SMC procedure
http://support.apple.com/kb/HT3964
You may have done something similar already, but do it precisely as described.  You should disconnect ALL peripheral devices, except for Apple keyboard and mouse.
Also, when you plug it back in, if the iMac is currently plugged into an old (or overcrowded) power strip (surge suppressor), try connecting it directly to a wall outlet by itself. 

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