I recently purchased an AV receiver to augment my home entertainment setup. My iMac (late 2009) is in my living room. For years now (prior to getting the AV receiver) I've had the iMac connected directly to my TV via a mini-DVI-to-DVI adapter connected to a DVI-to-HDMI cable, and this worked great. (Audio was routed separately.) However, when I moved this video connection over to the receiver instead of the TV, I started having problems. The signal passes through just fine and looks great, but whenever I turn the receiver on or off, the screen of my iMac flashes blue for a second, as if the iMac thinks I have physically plugged or unplugged the secondary display. This never happened when it was directly connected to the TV and I turned the TV on or off. It's very annoying and disruptive. Is there any way to solve this problem? I thought about putting an HDMI repeater in the path. Maybe if the iMac sees an "always-on" device like a repeater, it won't do the blue flash thing when I turn the receiver on or off? Haven't tried that yet. For the time being, I have just gone back to connecting the iMac's video output directly to the TV and only routing the audio through the receiver, but ideally I would like to have both the video and the audio going through the receiver just to simplify things.