My Marantz 5012 had been working beautifully up until recently.\n\nAfter turning on the power, it automatically shuts off after 3s or so. \nNo changes have been made to the components plugged in. I know that it's receiving a video signal because my streaming device briefly appears on the tv screen. The only other device I have connected is a DAC\/Headphone amp.\n\n\nEco-Mode is turned off.\nIt is set to 'Pure Direct'. I've selected the other modes simply to rule them out.\nI've tried swapping out the receiver's power cable.\nI've tried resetting the receiver back to factory defaults.\n\n\nI love Marantz products, but I'm ready to nudge this one off the ledge of a second floor window.\n\nPlease help. Ideas to try?