I never had such problem before. After upgrading to Lion, while I connecting to TV from my iMac (I3 version), there's nothing shows on TV and the mouse was kinda freeze ( still usable but either moving very slow or fast). Check online but couldn't find exactly similar problem, not sure if this is also a known problem with Lion. I use mini display to HDMI adapter, work very well under snow leopard. Thanks for any input.