Sounds like Region free is working but there's a video issue...

Can you get the on-screen menus up? What is set for video setup: tv standard, powerup standard, scaler setup?

My 800 came back from its trip to the mothership for repair and firmware upgrade set to 1080p which my TV doesn't support, so I wonder if somehow it's been reset to something the HD621/TV can't handle.

It's worth a) taking out the HD621 and b) also connecting via the composite video output (which should always display regardless of other output options) and get the menus up so maybe you can do something with the 800 directly.

hope this helps

Chris

Lounge/Cinema, Trinnov, DSP8000XE, 4x 320.2 in-ceiling, M6 rear, 2x DSW.2
Roon Nucleus+ and 320.2 in-ceiling in many rooms (KEF in-ceiling in bathrooms)
Spare: DSP5000, 598, 562v2, 500Mk2, 518, 519, 504, 101B, M3, 861v4, 800 DVD, MS600, MC200