My 606 just crapped out on me because of this HDMI issue (or I presume that's what's up). Tried to hook up my M11x laptop via HDMI, which has worked flawlessly at 1080p in the past, laptop screen went dark like normal, but no signal on HDTV. Odd, I figured it was probably a driver issue.
Decided to watch a blu-ray instead. Turned on my BD590 and switched input on 606. HDMI flashed forever on the Onkyo, then it finally spit back no signal. Meanwhile I look at the display on the front of the BD590 and it's flashing back and forth between 1080i/1080p. Odd again, hooked it up using 480i single RCA to the front of the Onkyo - BD player menu shows up just fine. Forced the HDMI port to use 720p, hooked it back up to the Onkyo and it finally connected. Apparently I can't use 1080p on any sources at all anymore via the 606. Works great direct to the HDTV, but then I get no surround.
Called up Onkyo, they gave me two service centers. Called the local one first, they informed me that the HDMI boards are on back-order from Onkyo and the estimated time to get the part would be 6-8 weeks. That sucks. Called Onkyo's "USA Regional" service center, they couldn't give me a repair estimate time at all.
Called Onyko service & support again to request they expedite the process and the CSR chuckled at me and said "Sir, we have nothing to do with the speed of our repair centers".
So I think I'm done with Onkyo, I really don't want to be without a receiver for 8 weeks.
What's the recommended replacement for the 606? I've been looking at a Denon 1910 or maybe one from Yamaha.