| This is a Know problem with a 100% fix!
Ok I have seen loads of these iMac's with the problem, here is the solution to get the display up and running.
Step One
If the machine has a VGA port plug-in an external monitor and apply the firmware update.
Step Two
If you don't have a VGA port or an external monitor handy try letting the machine start up from a HD not a system CD when you get to the desktop just hit the space bar.
Step Three
If these don't work for you remove the RAM reset the machine the reset button is located to the left of the RAM slots a little round button.
If the above don't work you're stuffed, I've seen this problem on lots of machines we keep a OS 9 hard disk in the office so we can boot up these old iMac's and press the space bar to wake the machine.
Another problem you can have if you don't update the firmware on the iMac's is a non functioning mouse.
Always make sure you have the latest firmware on your mac before updating and on devices like firewire drives.
Hope this helps you.
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