When connecting Macbook Air to iMac, have to keep Macbook Air open in order to use the iMac as a display.
When I connect my Macbook Air to my iMac with Thunderbolt, I have to keep my Macbook Air open or else the iMac does not sense it. I've tried closing it to just use the iMac as the display, but then the iMac goes back to its regular screen. Also, I have to control everything from the MBA keyboard and touchpad- my iMac mouse and keyboard suddenly won't work. How do I fix this?