External Monitor Closing

Hi!
Well, I tried everything and FCP still closes unexpectedly. I have however narrowed my problem down to my external monitor. I run a Samsung Syncmaster 2494hs DVI 1920x1080 with my iMAc 27" i5. On any quality it closes. As soon as I disconnect it, FCP does not close anymore. My MagicMouse also acts all funny. It jumps round in the timeline and doesn't want to select clips in the timeline firs time.
Does somebody know how to fix this problem? Do I need specific drivers?
Thanx!

what is the connection path from the Mac to the monitor? DVI
what other devices are connected to the Mac external - ie hard drives? External Firewire 2TB WD hard drive.
are you running other applications at the same time as FCP? No

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