Screen scrolls at higher resolutions

I have two identical servers, with the same spec except processor speed and amount of RAM.
Everything else is the same.

One is running SBS 2003 (and therefore 32-bit)
The other is runniny W2k3 Enterprise 64-bit

the first displays happily at 1600x1200 on my monitor.
the second does not. I can select 1600x1200 only by using "List all modes" and then it actually displays at something lower (I think 1280x1024) and pans around the logical desktop when the mouse pointer reaches an edge.

Both servers have the same (RADEON 7000) video card and both use MS drivers - no fancy ATI drivers here thank you.

The 64-bit one is of course a different version number (they match what I've read should be the MS drivers for XP32 and XP64 as you would expect.)

So why does the 64-bit machine scroll around the desktop?
To add insult to injury, yesterday the second machine was displaying proper 1600x1200 without scrolling - it just stopped doing it after a reboot today!
ATOCONSAsked:
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doublestickCommented:
are the monitors identical? maybe one cannot display that res?
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ATOCONSAuthor Commented:
It is the same monitor. It's on a minicom smartcat5 kvm switch
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CallandorCommented:
The problem is that cat5 extenders do not do a good job of transmitting EDID information from the monitor, which is how the video card knows what resolutions are possible.  If you connect a monitor directly to the server, you will see this is the case.  The only fix is to try a different KVM or connect it to a dedicated monitor.
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ATOCONSAuthor Commented:
I take the point, but it's strange that it works on one machine and not on the other, if that's the case.
And that it worked on this machine until a couple of days ago. How would that tie in with being a cat5 extender issue?
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CallandorCommented:
If the monitor is not reliably detected, the results will be random.  It should be easy to hook up a monitor directly to get an answer.
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ATOCONSAuthor Commented:
Well, I'll see when I get a chance to take a monitor to the server rack
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ATOCONSAuthor Commented:
OK connected the monitor locally.
It made no difference.
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CallandorCommented:
Did you get a Windows update between the time it worked and when it stopped?  Those can have an unintended effect on components.  The only other difference is the drivers - one is a 32-bit and the other is a 64-bit, based on your OS descriptions.
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ATOCONSAuthor Commented:
Updates - tell me about it! I've had horrendous problems with this month's Tuesday updates.
1 client had to system restore in safe mode, 1 had to system restore and rejoin the domain, other problems - hours of undoing MS breakages.

But I digress... This started before the Tuesday updates.

[edit: I should clarify - it was after the Tuesday updates were released by MS, but after my issues with the clients, I didn't install any of the Tuesday updates on the server. At least, not intentionally. I wonder if there was one of those that install automatically despite my settings to download only...Hmm, must check update install dates. Good thought, thanks.]

I have ensured the monitor driver is identical on both systems now - by loading the monitor (Dell) .inf, which is for all Windows, 32 or 64 bit.
I have installed the latest ATI driver version too. Neither of these has made a difference.
It's a strange problem...
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ATOCONSAuthor Commented:
No installs at around the time this started - according to the Add/Remove install dates anyway.
But I have the ATI driver installed now anyway so I would expect that to have fixed it if it were a MS update to drivers. Could be some unintended consequence from an update unrelated (apparently) to display, I guess.
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CallandorCommented:
The only obvious thing left, other than an update, is that the video card is slightly different between the two.  Even if the two models are the same, one may have suffered degradation.  Are these the ancient 7000 series released 10 years ago? http://reviews.cnet.com/graphics-cards/ati-radeon-7000/1707-8902_7-9388306.html - if so, the capacitors on them may have started drying out.
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ATOCONSAuthor Commented:
This is possible though I guess I'll never know.

However, it seems there's no definitive answer, but I'm very appreciative of your time and efforts.

If no further suggestions come in a few days I'll close the question and award some points for the help if not for solution!

Many thanks
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CallandorCommented:
The only way to know for sure is to swap the cards and see if the problem follows the card.  I understand that it might be difficult, as it involves two servers which may not have time to be down at the same time.
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ATOCONSAuthor Commented:
Help provided but did not resolve the issue. Nevertheless, thankful for help.
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Windows Server 2003

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