17"display with extern power supply won´t work

Hi there,
my second display a 17"apple studio display (CRT with VGA) just works every now and then. Can´t locate what´s wrong, I already changed the graphic card, no result. In system profiler both displays are listed mostly, also in the display menue on the topbar, though as soon as I tell to recognize the displays only the main display remains. The 17" display has the extern power supply, but it´s a original apple as well. Thought it might be a bad contact, but can´t find anything. Living here in spain I nearly have no chance to check the display by a dealer. I would be grateful for some help, Michael.
G5 Mac OS X (10.3.8)

Try an SMC reset:
http://docs.info.apple.com/article.html?artnum=303319

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Powering down display with external power supply

I am using a 23" display with an old PowerMac G4 from 1998 with an upgraded video card and external power supply.
Is there any way to power off the monitor without powering down the computer? Ideally I'd like this to happen automatically based on my system prefs, but apparently the external power supply precludes this.
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You can install an on-off switch on the power lead to the external power supply (actually, it's safer to have a qualified electrician do this, as you are dealing with a mains power supply). I have this system for my ADC 15" Display, and it works fine.
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It's more appropriate to "sleep" the display. You can do this (via Energy saver settings in System Preferences) without having to "sleep" the entire computer. This will turn off the backlights and significantly extend the life of the display.
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17"display with extern power supply won´t work

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