IMac G5 has power but no display

I bought an iMac G5 iSight 17" from my neighbor thinking I could get it work, then afterward learn some more about Apple computers. It powers up fine but the screen is dark. I bought another lcd online for $100+, took the front panel off, and installed it but same issue is happening. One thing I did notice during re-assembly...  the front plastic cover that slides off away from the lcd has 2 connectors on top:  a thick one for the camera, and another 2-wire one that leads into a small round silver cylinder inside the top of the plastic cover (maybe a ground?). Anyway one of the two wires that go into the cylinder is broken. My question is what does this wire control?  And could this be the reason neither of my displays works?  Thanks for any help out there.  I'm NEW to iMacs. 

Hello,
At this point I think your best bet is to take it in for servicing at the local service center.
As for your data, I think odds are that it is still in-tact. The type of failure you describe sounds more like a failed logic-board or possibly the power supply (improper voltage / low-voltage).
Most likely it's a failed logic-board. But, the power supply can cause these symptoms as well.
Neither would mean that your hard drive is bad. It's possible that it is, but it's not an automatic definite.
If it were only the hard drive that failed, then you'd get the grey Apple screen with a flashing question-mark.
So, what I would do, is request them to fix the computer. But, I would put a stipulation on it that requires them to call you if they are going to re-format or replace the hard drive.
This way you'll know in advance if they are going to erase your data. You could then decide whether to pay them to archive it onto another media or back it up for you, or just let it go.
Explain to them that you have information you are concerned about saving. And, request them to at least let you know if their repair process is going to require them to do anything that might erase the hard drive.
I think that's about the best you can do at this point.
I hope this helps.

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