42LG50 HDMI error message

This is one of many reasons I recommend against routing ANY video through a receiver if the TV/ monitor has enough connections for all of the video sources.

Bypass the receiver andsee what happens, then isolate a cause.

Are you not getting audio to the television speakers and the onkyo reciever speakers when connected HDMI thru the reciever or just the television. If it is just thru the television then it is because the reciever is grabbing the HDMI audio signal and converting it so it does not reach the TV. If it is both then try changing the HDMI signal output from PCM to DOLBY DIGITAL on the computer. Your reciever may not be able to process the PCM signal of the computer. Does the reciever show a PCM or DOBLY DIGITAL display when HDMI is hooked up to it?

You say this doesn't happen on regular cable or when playing a regular DVD. Hmm. Is this Blu-Ray player connected by simplink? HDMI is a bi-directional format cable, so  there are cases in setups where your tv can send commands to your blu-ray player and vice versa. It could be a problem with your blu-ray player that it is sending for some odd reason a mute command to your tv. Or is processing a command that your TV interprets to be a mute command when playing blu-rays. Because if it was the TV itself chances are you'd see this when watching a normal DVD or on cable as well. Since you say you're not, it leads me to believe the issue lies with the blu-ray player itself. 

Since the reciever does not show any picture use that hdmi input for the x box. and component inputs for the reciever.

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The HDMI inputs are pass through inputs only. The reciever cannot recieve any sound signals through the HDMI's. The reciever acts as a selector switch for the HDMI inputs. Whatever input you have selected on the reciever is the one that is being sent through the output to your TV. The "unlock" display shows when there is no sound signal sent to the reciever. There is no code to unlock. This is the reciever's way of telling you that there is no sound being sent to it from that input. Since there is no sound being processed from the HDMI's, you need to hook up an additional audio cable from the device to the reciever (preferrably an optical cable). When the reciever recieves an audio signal, it will then "unlock" and you will get sound. The only purpose for the HDMI jacks on this reciever is to give you a bonus HDMI jack so you only have to use one on your TV. I know it is confusing. I had to look into this problem myself, so I'm happy to help. Higher end recievers will actually recieve and process sound signals from the HDMI's.

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Since you have the cable connected to the reciever thru the HDMI, you may have accidently changed the input source of the reciever from HDMI or digital to analog.

When you have the reciever set to listen to the cable, check the input mode and make sure it is set to use the HDMI or digital input and not the analog.
The rca jacks are analog, and they worked, so I think you have just solved your own problem without realizing it.

Let me know if this works and if so a good rating would be appreciated. Thanks and have a great day

In the setup guide, try going to the HDMI option where you turn the montior out to "on" for the HDMI output. I don't believe that the receiver comes with the HDMI out already turned on...

it sounds like the A/V reciever does not upconvert the component signal to HDMI. Not many do. The Marantz recievers will (SR6001, SR8001, etc..). Also bear in mind that HDMI cables are finicky and may require amplification over a few meters long.