I see you had it working on HDMI port 2 then changed to 3. There are deep issues with HDMI's HDCP handshake and Sony has a history. We have some long discussions about that so I'll not duplicate that here.
Cut your losses now and try the same port that worked, ask monoprice what's up and my bet it you won't keep these same items. Something must change if all the HDMI ports fail.
Let me be clear about this. HDMI/HDCP is not consumer friendly.
TV = Samsung LNT4053
Blu-ray = Sony BDP-S590
Setup works when using red, white & yellow component cables (player connected directly to TV)
Setup works when player is directly connected to TV through HDMI cable (to HDMI 3 port)
Setup DOES NOT work when connecting player (on HDMI 2 DVD port) through CAT5 connection utilizing Monoprice HDMI extender:
When the Blue-ray player is powered on, the TV and player are visibly communicating as you will quickly see a "Blu-ray" trademark displayed on the TV screen, then a black screen with the below error messages. When the Blu-ray player is powered off the TV displays white static.
Error received on TV is:
"Searching for Signals", then displays
"Check signal cable", then displays
"Not supported mode"
These three error codes just keep cycling over and over...
Any help would be greatly appreciated!
Please do not recommend I use the direct connect solution as my wife will not allow it. It puts the player on the floor below the TV which she has said is "unacceptable" even though it's fine by me, LOL...