HDCP is rearing its ugly head again, looks like. I had a similar problem when trying to HU a cable box thru an HDMI switching Pioneer AVR. Was told by Pio that AVRs sometimes "look" like HD recording devices to the HDMI copyguard circuits (HDMI's only real claim to fame), shutting down the signal. That's why you see a pic for a second then it disappears - HDMI's anti-piracy circuits. Sure enough, going a different connection route it worked fine on component or when the HDMI was run directly to the TV, bypassing the AVR.
So you don't get pic even when running the HDMI directly to the TV, bypassing the AVR switching? Then perhaps something in the totally unnecessary and highly sophisticated - read that "cumbersome and lengthy and prone to difficulty" - HDMI circuits is causing the required handshake to break down. Hitachi had such trouble with their HDMI circuits that one of their entire boards had to be re-engineered and installed on location in all their units, costing them horrendous on-location technician service fees. Those service techs who were not in the loop usually didn't know to exchange the eeproms in the convergence circuits, replacing the new virgin (ie. blank) ones with the old already-successfully programmed ones before installing the replacement boards, and as a result had to set up the geometry and convergence entirely from scratch. IOW a nightmare waiting to happen, as very few repair service techs know didly about geometry and convergence.
If all else fails, the HD Fury series works wonders when your HDMI is giving you grief. Impeccable picture. I have a Mit 73" CRT whose HDMI circuit is total crap - delivers a mulchy pic, far inferior to its excellent component circuits. Mit did well when it was DVI but lost their edge the following year when they went to HDMI, so I use a Fury whenever I absolutely need HDMI, such as for upconverting SD 480i DVDs to 1080i inside the bluray player and outputting the 480i content as 1080i via HDMI. You don't need HDMI for anything else as long as your source device has component outputs. Your set's component inputs will give you the highest grade pic available on 1080i without any
need for HDMI.
Component outputs of course cannot be found on new equipment today - component ouput has been outlawed now and we owners of pre-HDMI sets have been ground under and spat out by Big Brother - so if you have a bluray player with component output, shield that puppy from all potential buyers and hang onto it!