PowerMacG4 won't start without old Cinema Display attached

PowerMacG4 867dp (Mirror Door)
NVidia GeForce4mx w/ADC+DVI
20" Cinema Display w/ power switch, on ADC port
Acer 23" G23HL, on DVI port
I replaced my failing ADC with a new display (with much-appreciated help from this board!) Works fine as dominant display (currently not mirrored) but I need Cinema Display attached and powered up to run system. The Power Switch on tower lights, but won't shut down system, or start it without ADC attached. (It won't control system at all, only Power Switch on ADC works) Nothing in Preferences seems to apply. Should I just duct-tape new Display over old ADC and move on??? THANKS!

Thanks for your response BD Aqua. I don't have those diagnostics and frankly still wouldn't have a clue if I did. I was hoping I had overlooked some simple Preferance-type step in the change-over, but beyond maybe changing the old battery next, I'll just put one screen in front of the other- fortunately I've got room. Thanks again for your reply!

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How to connect old Cinema Display (plastic frame) to new imac 2012 27"?, How to connect old Cinema Display (plastic frame) to new imac 2012 27"?

I just got an imac 27 late 2012, and like to connect and old Cinema Display 20" with plastic border( looks like an easel) what adapter do I need?, if this. Is possible at all..., thank you

Hi Cathy,
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Maximum VRAM:
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I have an old Cinema Display that I want to use with my new MacBook. I just bought the DVI to ADC adapter. I can connect the Cinema Display to the adapter but the manual illustrates that to connect to the MacBook I need to use both the USB port and another port for which there is no equivalent port on my new laptop. Any ideas?

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Hi everyone!
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The first time I started after I changed the PRAM battaery it eventualy turned on and I saw the gray screen with the Apple logo and the spinning weel but after 5 minutes I turned it off because it did not finished the booting.
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https://discussions.apple.com/message/15223603#15223603
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https://discussions.apple.com/message/15613068#15613068
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Heat gun better...
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Is it the Apple version of the DVI to ADC adapter? The signals from a Mini DisplayPort (or Thunderbolt) to DVI adapter may be weaker than normal DVI signals. The Apple DVI to ADC adapter amplifies the DVI signals, so can work with signals that are too weak for non-Apple adapters.
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<http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx>

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Hi Larry!
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I am experiencing the same problem with a Samsung Aquos 52" connected thorough a Onkyo receiver/amplifier. The connection is DVI to HDMI to Onkyo amplifier and HDMI-HDMI to the TV. The main 23" Cinema Display flashes during turning on an off of both of TV and the amplifier and even when the TV is off and the amplifier is on, unless you restart the computer, it would keep detecting a second display, the only solution so far was to unattach the second display DVI to HDMI cable from the computer. Otherwise, several freezes occur after several flashes of the cinema display and eventually either the dock o the whole screen would freeze...Anyone knows how to avoid this issue? Btw, my id card is NVIDIA GeForce 6600.

PowerMacG4 won't start without old Cinema Display attached

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