Dual displays on a Power Mac G5

A friend of mine has a DP 1.8 G5 tower with a dual head DVI card with two ADC 17" cinema displays connected to it using the DVI to ADC adapter. On one of the displays the color is inverted. All of the color settings are set correctly, and the display setting is set to the correct "Black on White" in universal access. It isn't an issue with the display since when you toggle the display setting to "White on Black" it just changes which of the two displays is the inverted one. Other monitors have been plugged into the machine with the same result. Likewise, it isn't an issue with the graphics cars as the card was recently upgraded and the problem with the inverted color persists.
This feels like a problem in software and not in the hardware, but perhaps the computer doesn't like having two displays plugged in with the adapter. Though we have tried other displays they have all been, shockingly, ADC displays. I plan on lugging over my 20" Aluminum soon to see if that works normally. I suspect that it will. Anyone have any ideas?

Have you tried swapping the adaptors or trying someone elses? If the card has been swapped, that is the remaining hardware to check. Also, if you are not in 10.4.5 I'd try the upgrade, do one thing at a time to see which fixes it - if either. I suspect one adaptor is faulty. Are these the one's from Apple or are they 3rd party?
G5 Quad Mac OS X (10.4.5) 4 GB RAM, 500GB ATA HD, NVIDEA GeForce 7800 GT, 23" HD Cinema Display

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<http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?mco=64 1148B1&fnode=home/shopmac/macaccessories/displays&nplm=M8661LL/B>

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Hi Curtis,
I'm not sure though if 80C is normal for a G5 or not. I noticed that when it was unplugged that it wouldn't retain the time
Nope, not normal, way too hot, above 70°C... If you have any temps in the 70°C/160°F range, that's likely it.
Have you blown the dust out of everything with high pressure air?\
1. Maybe All the RAM is bad
The Memory test can really only be trusted if it finds a problem, not if it doesn't find a problem.
Memtest OS X...
http://www.memtestosx.org/joomla/index.php
Rember is a freeware GUI for the memtest ...
http://tech.kateva.org/2005/10/rember-freeware-memory-test-utility.html
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
It can show on any G5, and even many other computers & electronic devices of the period.
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http://lowendmac.com/ppc/power-macintosh-g5.html
2. Maybe the dead battery is messing it up?
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems, thoigh not once vooted as a rule...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
3. When it is heating up with use, something is expanding and not connecting any longer.
Could be the lead free solder issue with the RAM slot, and/or the thermal paste between CPUs & heatsinks need replacing...
https://discussions.apple.com/message/16223700#16223700

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japamac-
Thanks so much for your reply. You're right on target for what I'm looking for and that article is VERY helpful! If you don't mind, I do have a couple more questions/clarifications.
1) First, I think that I didn't read the Wikipedia reference concerning DVI (http://en.wikipedia.org/wiki/DigitalVisualInterface) closely enough. It includes the following paragraph. If I understand it and what you said, it shouldn't be a problem to connect the male DVI-D of the converter into the female DVI-I socket of my Power Mac. Right?
+The long flat pin on a DVI-I connector is wider than the same pin on a DVI-D connector, so it is not possible to connect a male DVI-I to a female DVI-D by removing the 4 analog pins. It is possible, however, to connect a male DVI-D cable to a female DVI-I connector. Many flat panel LCD monitors have only the DVI-D connection so that a DVI-D male to DVI-D male cable will suffice when connecting the monitor to a computer's DVI-I female connector.+
2) I'm not clear on the difference between the Altona AT-DP200 and the Gefen converter. The Gefen converter is somewhat less expensive, so I'm trying to figure out what the downside is. The article you mentioned says that the ATP-DP200 "doesn't scale images", but that seems to only be an issue if I'm trying to connect other devices (PS3, Blu-ray), not if I just want to connect my Power Mac.
The description of the Gefen converter includes the following drawbacks:
+The only major drawback to Gefen's solution is no support for VGA devices or HDCP. A minor gripe would be the fact that the Gefen device only accepts one input resolution and only outputs one resolution (1920 x 1200 at 60 Hz). These limited options aside, the Gefen device looks like it could do the basic trick of transforming a DVI signal to Mini DisplayPort so that you could use your 27" iMac for a few more purposes, provided that the input signal carries the required 1920 x 1200 resolution.+
I'm not clear on what the practical impact of those limitations would be. I don't think the the lack of support for VGA devices or HDCP is an issue for my application. But I'm wondering about the statement that it only accepts one input resolution and outputs only one resolution (1920 x 1200) and the need for the input signal to carry 1920 x 1200. I take it, first of all, that the Power Mac can supply that input resolution. And, what is the impact of the device only having that resolution output to the iMac screen? That is, how would that look on the screen, ugly or okay? Finally, would the Altona device provide a better looking output on the iMac screen because it can apparently handle different resolutions? The manufacturer's description says, "Resolutions: all resolutions up to 1920x1200 (It is Important to select one of the resolutions that display
is capable of displaying, refer to your display’s users manual)."
Thanks again.

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