DVI connected external monitor now having mouse troubles

Hi Everyone, I'm new. I recently bought a 27inch imac and a DVI adapter to hook up a second monitor. When the second monitor is plugged in and on everything is ok. When the second monitor is unplugged everything is ok. When the second monitor is pluged in but turned off my mouse skips LOTS. Like it lags a bit then will shoot off to the side of the screen. I tried other mice (apple and microsoft) and different mouse pads/none/paper and no difference. I rang applecare (before I realised it was to do with the monitor) and they told me my mouse was stuffed.... Im convinced the imac gets confused when anothe monitor is connected. Others on mac rumors are having trouble also... Any ideas please?
Cheers
Jaidan

Hello,
I can confirm this problem on my iMac 27" of Mid 2010.
At first in June, when i bought it, i had no problem whatsoever connecting my external Samsung 226bw. It worked like a charm.
After some time, maybe a month of daily use, the iMac refused to wake up the external monitor after waking from sleep mode. Now the problem only got even worse, as it now refuses to power up the external monitor when booting too.
The funny thing is it springs alive after a random period of time. (between 2 to 4 hours)
When the iMac is in its 'Im ignoring your external monitor, Sir' mode, my magic mouse is very jumpy and laggy, like described earlier on in this thread. When the monitor comes alive, the mouse behaves normal.
Now i've been looking into this problem quite some time now on the net, and all i can find are mostly confirmations of people having the same problem.
There are some suggestions here and there on what to do, like resetting nvram or the SMC, deleting windowserver preferences files etc, but none of them seem to solve the issue.
Strange thing is that Apple doesn't move a word about this? At least an acknowledgment of some sort, letting us know they are aware of the problem and maybe try to fix it.
Message was edited by: Tw3aky

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How connect External monitor to iMac?

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Please look at the iMac images and descriptions in the links on this site:
http://www.everymac.com/systems/apple/imac/index-imac.html
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Hi JohnD7,
Welcom to Lenovo Community Forums!
Make sure that the Main LCD isused as the main LCD.
Open Screen resolution page
1. In the first box select your Main LCD
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Lloyd Lathrop wrote:
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Hi
For resolving the mentioned issue , Please try the following
1. Update the Bios to latest version
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS014992
2. Update the Display Video drivers
http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&DocID=HT063249
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I hope this helps

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DVI connected external monitor now having mouse troubles

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