I just purchased a Mac Mini a couple of days ago to use as a media center. I've got it hooked up HDMI too a Denon AVR-1612 and then to a 55" LG LED TV. Randomly the screen will go black for a second or so and then come back on. Sometimes it will go for a couple minutes without happening and sometimes it will be 30 min. I've tried a different reciever and different HDMI cables. Right now I've got a HDMI over cat5e running from the TV to the reciever but I've tried just a regular HDMI cable in place and there was no change. I've also tried a different input on the TV. Any suggestions would be most helpful.