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Converting an iMac G4 - A Few Questions

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Sandy
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i5-2500K
Graphics
GTX 770
Mac
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I got a 15" iMac G4 for Christmas. Both myself and the gifter don't expect it to remain a G4.

I was going to leave it for a while, but the arrival of small, cheap PCs is making converting it a lot more attractive. Because of long lead times, I want to start gathering parts now.

Most of the G4 conversions seem to be on this site, so I'm thinking the body of knowledge is here and this is the best place to ask questions. There's a few things I'm looking for some clarification on:


  1. How is sleeping the LCD and turning off the backlight handled? I thought this was handled by a pin on the DVI connector, but looking at it again, I don't think this exists.
  2. Has anyone successfully reused the Pro Speakers using the original audio jack?
  3. I seem to recall seeing a conversion using a 19V to 12V step-down that was abandoned because of noise issues. Has anyone done it this way or am I thinking of something else?

I might come up with more questions later, but that's what's on my mind right now.
 
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