Mac mini to Marantz 1606 - picture is intermittent, flashing, turns on and off
I have a mac mini that i've used perfectly with my hdmi switcher and toshiba tv for a year or so. I recently upgraded the HDMI switcher to a Marantz 1606 and am having problems with my mac mini. All my other sources (Sky +, panasonic blu ray) work perfectly, but the mac mini displays a picture for about 10 seconds and then flashes off. There's no change to the display on the marantz display unit, but the picture goes completely on the tv. If i'm in a menu on the marantz, that disappears too (so it's not just the pic coming from the mac that's going). I've tried different HDMI cables, I've tried different inputs on the Marantz, and I've done an NV RAM reset on the mac mini, all to no avail. Grateful for any suggestions as to what could be the problem, and how I go about fixing it...
thanks in advance.
John