I have a 27" iMac, and i have a 26" samsung LCD im using for the external monitor, and i have it hooked up with a mini display to DVI, and a DVI to HDMI to the TV. the problem is when the TV is off, the mouse is super jumpy, when its moved. It jumps all over the screen, even if i have no need for the monitor to be on, i still turn it on just to be able to use the mouse. Has anyone else run into this problem? Is there a way to resolve it with out having to unplug the mini display port?