If youre using HDMI for all your connections you don't need anything else (as you described DVD, Cable and PS3 to receiver and from receiver to TV)
You only need Optical or Coaxial cables to your receiver if you connect your components to TV using HDMI's ... but in your case you won't
I just mentioned the different kinds of cables when I read that you were using component to connect your DVD
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... then i have a dvd player which i was going to hook up composite to my receiver, cd player to my reciver (not sure how to hook it up) ...
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Sorry for the confussion ...

... Feel free to ask anything, there's always somebody here to help us (Don't think is a dumb question, We asked the same when we started in this hobby

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