I have 2 Gigabite 19'' - 8ms monitors plugged into a G5 mac. Both was working fine. The right hand screen (second display) switches on with start up and then 2sec later it switches off. Then i can switch it on manually then it displays for 2 sec then switches off again...?

If its a PowerPC G5, Then first check display with another computer or you can connect another screen to your G5 Mac if you have a dvi port on the video card. It's most probably either the monitor or video card. Sometimes it might be defective ram.
Thanks.

Mac Repair tech from

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Follow steps in sequence:

1. Turn Off Monitor by pressing power button on LCD
2. Shut down computer
3. Unplug power cable from LCD, Once power cable is unplugged from LCD, press and hold down the power button on LCD for 15 seconds

4. Unplug the power cable from the back of Desktop Computer and Hold down the power button on desktop computer for 15 seconds

5. Plug the power cables back into the LCD and Desktop Computer

6. Power on computer and then power on LCD, it should work

get an external monitor and the correct dvi adapter and plug it in to te back and turn it m Make sure that in the >System Preferences>Displays you have mirroring turned on then you should be able to a least use your mac. My sister had the same problem this solved it somewhat She hides the iMAC behind the new screen. Only other solution would be to take the iMAc in and probably have the display board replaced which would cost you more than the new screen. You will still have the new screen to put on a new computer and use it as a second display.
I have two 24 inch displays on my computer

Both monitors must be plugged in when the computer is started for the second monitor to be detected, and you must configure the second monitor once the computer has started
In windows XP: control panel -> display -> settings tab -> select second display -> check "extend my windows desktop onto this monitor" -> click apply
In windows vista/7: control panel -> adjust screen resolution -> select second display and then under "multiple displays" select "Extend desktop to this display"

Sir,
The iMac G5 and iMac G5 (Ambient Light Sensor) computers have a video out port located on the back of the computer, which will mirror video. Video mirroring means you can see the same image that is on the iMac G5's flat-panel display on an external monitor, television, or projector.
Using the video out port, you can mirror video with a compatible VGA display using the Apple VGA Display Adapter.
You can also use the video mirroring feature with a television or projector that has S-video or composite video connectors when you use the Apple Video Adapter.
Both the Apple VGA Display Adapter (M8639G/A) and the Apple Video Adapter (M9109G/A) are available separately, and are needed if you want to use your iMac with a VGA monitor cable, S-video cable, or composite video cable.
The video mirroring feature is "plug and play". Simply connect a VGA display, television, or projector to the appropriate adapter (see above), then connect the adapter to the video out port located on the back of the computer.
When you connect the adapter to the computer, the screen may refresh momentarily as the computer prepares itself for the new video output. The computer tries to match the resolution of the built-in and external display. If there is no match, the computer changes both screen resolutions and may black out areas on the built-in display in order to match the capabilities of the external display.
Important: To ensure that your iMac G5 automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac G5.
You can switch resolutions and frequencies for both the iMac G5 flat-panel display and the external display, television, or projector using Displays preferences.
Want to watch a DVD movie disc on a television that's connected to your iMac G5? Select a 720 x 480 NTSC (in the United States) or 720 x 576 PAL (in Europe and other regions) resolution in Displays preferences.
Tip: Because of the display limitations of most televisions, the images displayed on a television screen are usually not as high quality as those on the built-in display or an external monitor.


Thanks
Good Luck

Hi, I'm sorry to hear you are having trouble....
THis is a tricky one. My first step would be to connect another screen to your G5 and connect your V223w to another Mac... Are you able to do this, do you have access to another system, could even be a PC ( in the worst case )
Ideally, having 2 screens connected to your G5 would be the best situation.
THis way, with one working screen, you can attempt to modify the resolution and refresh rates on the V223w from the good screen, be sure to activate screen mirroring, otherwise you will not have access to the other window of monitors system preferences.
If you can get two monitors connected and mirroring is not an option, then either your monitor is KAPUT or the video card secondary port is KAPUT, try switching the port of the card your displays are connected to. I think they are both DVI ports. If the opposite screen is now working, then you know it's the port on the video card.
Hope this will get you through it.

try updating the drivers sounds like a software issue conflicting when putting other connections in

actionman

This is only a calibration issue. Your monitor is fine. and the card is fine. I would go to your displays preference and go to calabrate your monitor again. This time just choose the calabration from the default one. Ask someone else if they can see the box you just put on there. Sometimes it helps to have a second set of eyes.

The connector you have on the back of the video card is called and ADC connector, Dr. Bott used to make adatpers from ADC to DVI and ADC to VGA, but has since stopped making them, you should be able to those special adapters on ebay.

Right I got my formac monitor open by removing the Bezel, it's tricky but not too hard. The casing is suprisingly flexible and forgiving. The clips are backed by a double sided tape on all four edges. Start from the top and give the tape time under tension to come unstuck, it will, a bit like a plaster.
Oh yes, unplug before continuing.
Inside there are four HEX #4 (5/64 inch) screws holding the display inside the chassis. These can be removed, on the back side of the panel is the power/controller board. And remaining in the chassis is the Cold Cathode power board (long thin one on one side). This can be unplugged to get more range on the cables. (remember which way it goes in, I use a marker pen over the plug and socket to show me where to put it back) The Controller board has a number of power components. Firstly there are 5 power diodes, they all seem to respond properly under a meter in my screen. There remains one linear voltage regulator LT1117 and two 500Khz Step down switch mode regulators, LT1374. These devices are most suspect for causing the over current draw. Replace them if you can do this with ease. However most regulators have inbuilt protection. So it is also possible that a support component such as a resistor or capacitor has failed causing the other components to operate outside of their intended parameters. I will post some pics of the board later.

Dr Matt