Have the same SR7009, bought in 2015 had similar problem. Cbl/Sat HDMI blacked out 3 1/2 years after I purchased it. So out of warranty. Replaced cables, pvr etc when it happened as I didn't expect the amp would be faulty. Then moved to another HDMI port and it worked. back to the Cbl port and nothing. Now second port went black, moved to another port and working. However looks like the third port is flickering, so getting a feeling it's all going to go soon. Sold as a top end receiver, but reading around, it's a common problem and Marantz are just turning their back on all of us who support them. It's a factory fault and Marantz should recall or have service companies install a new/updated HDMI board. As mentioned, can't sell it as who would buy a faulty unit.