IMac G3 CRT Black Screen Issue

I recently got a 400 Mhz iMac G3 from a friend who wanted to get rid of it. It has one problem: for some reason the CRT will not display anything. Immediately when I push the power button on, the monitor sounds like it has been turned on, sometimes even flickers at the edges, but just doesn't display anything. The VGA output on the back of the Mac works fine, it has the most recent firmware (4.1.9), the power button doesn't flash, nothing. Everything seems to be working fine except for the monitor. To me it sounds like a video connection is loose or somehow disconnected, but I don't want to have to mess around inside of it if there's an easier solution. Thanks in advance.

Hi! Same info is required about type of computer you have as I listed in the post you replied to.
At first, your problem sounds like the firmware was not updated to 'iMac Firmware Update 4.1.9' before you upgraded from OS9 to OS10 - and there is one possible solution I've read of that worked with an imac 233 MHz - in that you've got to take out the logic board and use a different computer and/or screen 'set-up' to install the firmware update on that logic board,and then put it back into the original machine it came from and start it up while you cross your fingers!!! - and hope the screen comes alive again. tricky stuff that may not work.
However that may not be your specific problem - it may be the hard drive gone or something else (we hope).
When you reset the PRAM did you allow for the 2 separate chimes to sound before restarting your machine? That's really academic if the firmware is the problem - but I thought I'd ask.
So tell us what sort of iMac it is - place it upside down on a soft cloth and on it's neat little bottom it should have a description - like say,
- IMAC 600/GR/256/40/CDRW/ULTRA/56K/FW/VGA -
or just tell us if it's slot loading or tray loading, what colour, and anything else about it's model that you already knew - speed e.g. 400MHz - does it burn Cd's or jsut read them - stuff like that.
thanks
Gregg

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