20inch cinema display not working via ADC?

Heres the specs on my Mac
Dual 450mhz Gigabit Ethernet Model
OS X 10.3.9
1.38GB SDRAM
ATI 128 video card -----> now nvidia GeForce 4 MX
The Story:
I have had my G4 since it was new. I bought it with the 17" Studio Display and it has worked fine. and still works fine with both video cards mentioned above. I bought a used 20" Cinema Display. I saw the display working off an ADC connection before I even paid the guy. I brought the monitor home and tried it out. It loaded to the grey apple screen and then went blank. After some research I found out the ATI 128 only supports up to 17" display. So I got a nVidia GeForce4 MX, put it in my machine, fired it up and I get NO DISPLAY AT ALL! I plugged the 17" back in and it works just fine.
Also the guy I purchased it with threw in the apple DVI to ADC adapter, so I plugged the monitor into my Powerbook 1.33mhz and everything works just fine in mirror and dual display modes.
I am stumped. Can anyone help?
Thanks,
Jus

Hey guys,
I don't know if this will help, but here goes. I bought my 20" Cinema Display with the first G5s to come out ~ 9/2003. Lightning came in on my G5 thru the ethernet port and it wouldn't boot up. Frustrated, I unhooked everything and let the setup sit.
About a month ago I bought a G4 off ebay. It had a video card that had a DVI and VGA port--I guess it was an aftermarket upgrade. I was itching to try my 20" Cinema Display on it. So I bought the Apple DVI to ADC adapter ($99 thing). Hooked it up and sweet, screen real estate for days!
Came home a couple of days later, woke the G4 from sleep, and the Cinema Display stayed blank....f*!
I was p**d! I spent nearly $1200 for the thing, plus $99 for the adapter. I tried unplugging and plugging the adapter/display/G4 per the adapter instructions, still blank screen.
Well, today I had 3 different 22" LCDs in my newegg.com shopping cart and was ready to fork out $200-$300 for a new LCD with a DVI connection. I was convinced it was the adapter. So I thought I would try to hook the setup up 1 more time before I pulled out my debit card. I looked at the instructions again, and noticed apple pictured plugging the power cord into the adapter box first, then plugging the power cord coming from the adapter into the power source, then plugging the display into the adapter box, then plug the DVI cord from the adapter into the G4s video card (DVI-I port), then finally plug the USB cord from the adapter into the G4.
I powered up, and low and behold, I worked!!!
I'm typing this post on my 20" Cinema Display right now.
Only two things I can figure is setting the G4 and display to sleep is no good. The display and/or adapter seems not to work well with the sleep function. So I set System Preferences to never sleep for the display and the G4. Second, could there be a sensor where the power cord plugs into the adapter box? That's the only step I did different this time.
Sorry so long winded but if I can help out i want to 'cause I know how frustrated and sick I was about a having a kickin' $1200 display on the blink.
It could be just a coincidence, I'll repost if the Display goes blank again.
peace,
Danny

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20inch cinema display not working via ADC?

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