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This is more complicated than you may think. LolSo I know I can get a DVI to ADC adapter. Would you know if that would be able to power the Studio display if i swap back the DVI Card into the system? My guess is yes?
There are actually two different types of ADC adapters:
1. 1st ADC to DVI adapter is just this simple ADC to DVI port adapter:

This adapter plugs into the video card ADC port...and allows the use of a display with a DVI port via DVI video cable). This adapter only passes along the video signal...does not provide power to the display.
These can be rare...and sometimes super expensive. I have at least 2 of these.
2. The 2nd DVI to ADC adapter is this one:

I have 2 of these.
The brick in the photo is actually larger than it looks (it's actually about 5" x 5" x 1.5" thick)...much larger than the white power supply bricks you may have seen with MacBooks/MacBook Pro's/MacBook Air's.
There's an ADC port on the brick that the Apple display's ADC cable plugs into...then the connector on the end of the cable is DVI...and plugs into a DVI port on a video card with a DVI port.
This adapter does supply power to the Apple ADC display & the video signal (which of course is very important due to the single cable the Apple ADC display has).
These adapters originally sold for $150 bucks back in 2002 when they were originally released. Since then...the price has gone up & down (I've had various reasons over the years to price them now & then).
As they got more rare & as there was still demand for them (years ago)...their price remained high.
But demand for them must be going down...since when I checked eBay today...there seems to be a bunch selling for $50 or less.
HTH,
Nick