Chime, no video, no external video, fan on?

I picked up an iMac G4 1.25 GHz with startup chime, but no video and no video from an external display, and the fan is running. I reset the PMU and tried starting while Ethernetted to other Macs to see if disk would show up, but no-go on either.
I see this problem in several threads, but none that go as far as reporting back if an external display shows up, which mine does not.
Anyway, it seems logical to me that without video from either source, my video board is fried? Does it sound like I have a doorstop or is there anything else I could try?

But would any of those ideas you suggested (with the display, CCFL or inverter) cause the loss of an external display?
You're right about that. I forgot you mentioned trying the external video port. I think the external video would work if the problem was isolated to LCD sub-system.
Second, would a bad video controller cause it to not boot all the way up, even in target disk mode?
My theory is that the problem (wherever it is specifically) is causing the iMac to not pass its power-on self test. So it chimes, runs the diagnostic test, something does not pass, so it does not go any further. It is likely that the cause is on the logic board somewhere. If you had the original discs, there should be a hardware test app on it, but you probably did not get the discs with it.
Is there any way to bypass or graft another video controller and use it as a headless Mac?
If the iMac is not passing the power-on test, it does not necessarily mean that the cause is video related. The startup sequence could be stopping before the point where the video would come on. It could be the CPU or something else. If you have it open, you may want to remove the upper RAM module, in case that is the bad part. You can also try removing the PRAM battery; if you have a voltmeter, test it for 3.3 to 3.7 volts. It looks like this one
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
I've read reports that a weak or dead PRAM battery can cause odd startup issues. You can also try it with the PRAM battery removed, to see if there is any difference.
I don't know of any way to bypass the video on that iMac model.

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