Help with an AV processor

How do I do this? I have been running HDMI out from the oppo to the tv.  I can watch DVDs and listen to cds. I just tried running the cable server box to the HDMI in on the oppo then the output from the oppo to the tv. I had no picture so I switched it back until I'm more sure of what I'm doing. How do I proceed? And remember no one knows less about hooking this stuff up than I do. 

Al,
it comes up in a language I can't read. Maybe German?

Caphill,
Using the Oppo for a processor is the way to go for me as I want to keep things as simple as I can. I don't anticipate growing from 3.0 except maybe a sub. I do appreciate all of the info you gave me. THX

Tim, I've read and reread your post and now I have finally got it going but with a few issues. It seems I can run the two main speakers or the center channel but, so far, not at the same time. Under, audio processing- DTS NEO:6 mode, off engages the two main speakers as does the music option. The cinema option turns the two mains off and engages the center channel. How do I engage all 3 speakers at once? I went to Speaker Configuration and turned on the 3 speakers I have and turned off the others and selected 5.1 mode.

Thanks, Tim. Its all up and running now and sounds good. I don't know if adding a sub would improve the sound or not? Anyway, everything seems to be correct so I am very pleased and very appreciative of your help. I was able to get it all going by reading and rereading your posts. Thanks Again!

auxinput,  I will give that a try. Thanks

Tim,
Since very little music will be played on this system and almost all television will a sub be of much benefit? It sounds pretty good now on TV. I haven't tried a CD yet.