Received my replacement HR20-700 about an hour ago and been on the phone with DTV ever since. Out of the box the HDMI port doesn't seem to work (never had an issue w/ my last HR20 HDMI port). I am still unable to see the HD channels 70-79 in the guide or manually input 70-79. What gives? Are the HR20's this bad? She resent authorization multiple times and redone setup about 3x. Any ideas???