I do have a Dell workstation, but it is running with two NVS 285 video adapters and three monitors, so I cannot help you.
The only thing that came to my attention: Neither the T3500 Technical Guide nor the T5500 Technical Guide lists the NVS 420 as one of the supported options. This raises some questions. Did you buy the NVS 420 directly from Dell?
The following user says Thank You to Fat Tails for this post:
Interesting. It sounds like the monitor may be switching resolutions on you, but the fact it is happening on different physical monitors would rule out a bad cable/bent pin, etc.
Drivers are likely the culprit since it's about the only thing you haven't changed at this point. So, I think installing Windows 7 x64 is a good idea --- welcome to the future --- and has a good chance of solving the issue since the drivers will be an entirely different code base than XP.
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The following user says Thank You to Big Mike for this post:
If it is a hardware problem, it is Dell's problem and not yours. If it is a problem in setting up the machine correctly, it might be your problem. Did you check the Internet, whether there are others having the same experience?
Thanks! That makes sense. There must be some sort of issue with XP x64 and the drivers because I did attempt to uninstall the drivers and re-install the ones available from Nvidia's website. This actually made it worse which made me go back to the original drivers from Dell's website. I'm very hopeful Windows 7 x64 will do the trick!