Macbook Pro and KVM (Lindy KVM Switch Lite DVI 2 Port)

I have purchased the above to allow me to share my apple cinema screen, speakers, keyboard and mouse with my G5 Tower and MacBook Pro.
I have it all plugged in etc, but when I switch computers, the Macbook doesn't work properly, both screens flash blue on and off every 20 seconds or so. As if it is not detecting the screen properly.
Then when i switch back to the tower, there is a 10-20 second delay before the keyboard and mouse kicks in (the keyboard is plugged into the cinema screen and the mouse into the keyboard, as it should be)
I did find that if i plugged the keyboard straight into the KVM then I get no keyboard delay. But why when USb is going through the cinema display do i get such a long delay?
When the tower is selected the macbook still thinks there is a second screen attached (can see both in my display prefs) and goes into dual screen mode (which is the way i want to use it when all plugged in) but it is when i switch the Macbook, it all start to go wrong.
Any ideas? Have tired resetting everything (PRAm, plist, ejecting the screen (ctrl + shift + eject)), several times. Checked cables etc
I thought it could be hardware issue, perhaps the Macbook Pro doesn't give a big enough signal out of the KVM (as it has to travel two cable lengths)
The display works fine when plugged directly into the MBP.
I tried it in bootcamp (xp) and annoyingly the KVM works fine, and I get dual screen mode, share keyboard and audio as it should. It is only in Leopard 10.5.6 that i get the problems.
So it is not hardware as technically it has to power to do as it should (as windows proved), it seems more like a Apple software problem as it looks like it is constantly checking for displays and resetting itself.
Anyway to force it not to do this?
Thanks

I've just noticed a similar issue. I have an ATEN CS62DU switch between a PC with vista and a macbook pro 2.33ghz. 15.4inch (early 2007). Switching worked fine as far as I can remember, but after upgrading my mac to 10.5.6 it crashes as soon as I switch. Very very iritating.
Anyone else experienced kvm malfunction after the 10.5.X -> 10.5.6 upgrade?
Fred.

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Don't be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
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You should be wondering whether you can believe me, and whether it's safe to run a program at the behest of a stranger. In general, no, it's not safe and I don't encourage it.
In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it's transparent, so anyone with the necessary skill can verify what it does.
You may not be able to understand the script yourself. But variations of it have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message. See, for example, this discussion.
Nevertheless, if you can't satisfy yourself that these instructions are safe, don't follow them. Ask for other options.
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☞ Copy a particular line of text to the Clipboard.
☞ Paste into the window of another application.
☞ Wait for the test to run. It usually takes a few minutes.
☞ Paste the results, which will have been copied automatically, back into a reply on this page.
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If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, a series of lines will appear in the Terminal window like this:
[Process started]
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Wait for the final message "Process completed" to appear. If you don't see it within about ten minutes, the test probably won't complete in a reasonable time. In that case, press the key combination control-C or command-period to stop it and go to the next step. You'll have incomplete results, but still something.
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14. This is a public forum, and others may give you advice based on the results of the test. They speak for themselves, not for me. The test itself is harmless, but whatever else you're told to do may not be. For others who choose to run it, I don't recommend that you post the test results on this website unless I asked you to.
Copyright © 2014, 2015 by Linc Davis. As the sole author of this work (including the referenced "Diagnostic Test"), I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

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