Trying to connect new 20" imac to HT system. *Checked the cables I'm using on other HT components and they work fine. *Have DTV, DVD and iMac connected to switchbox running to projector. *DTV and DVD work fine (as does audio from itunes). *Problem is that I get no video signal out from iMac. *I been told to "force video out" by selecting mirror display but it won't even give me that option under arrangement if there is not a second display detected. *I've got the mini display to component adapter from apple. everthing else going to switch box is component also. *I've tried turning on the pj before and after mac boot-up and before and after starting different videos. I've also tried bypassing the switchbox and running directly to pj. *Still, nothing. *Any ideas. *I'm new to the mac world. *Any suggestions would be most appreciated. In case it matters, I've tried connecting to an Optoma EP749 and a Viewsonic Cine1000 with the same results. Curious if a "DVI-Detector" would solve the problem or if it would be required since I'm using a switchbox for all video to the pj?