IMac 27"intermittent input hangs with ext display attached

I'm having issues where every 3-4 seconds input will hang briefly with an external monitor attached. The monitor is a Dell E207WFPc connected via MDP-> DVI and the input devices range from the supplied wireless keyboard and Magic Mouse to wired keyboard and mouse. So far Activity Monitor doesn't show me that anything is spiking while this is happening. At first I thought it might me an issue with bluetooth but I turned off bluetooth and experienced the same issues.

numbasicks, if you haven't already, see this thread:
http://discussions.apple.com/thread.jspa?threadID=1965949
So far we've been able to determine it's MDP -> DVI only and it has nothing to do with Bluetooth. No solution yet. My personal case is a 27" iMac, ATI Radeon HD 4850, connected to a 19" ViewSonic display.
Message was edited by: Kai Brinker

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