I'm guessing that you accidentally hit a button on either the TV or DVD player that changed the input/out resolution. Some TV's don't auto-detect. (I have a cheapo projector for parties that does this when someone hits the wrong button on my equally cheapo DVD player.) I suggested you go through your set-up on both the DVD and TV from the beginning.
ok i got it to work. now my next question is i have two hdmi inputs and one hdmi output on my receiver,if i want something to go out the hdmi does it have to be going into one of the hdmi inputs or can i use a coaxial input and still have it go out the hdmi
thanks joe, im very new to this home theater thing so bear with me. i have my cable box wired to the receiver with a hdmi and the receiver wired to the tv with hdmi. the dvd is connected to the receiver with coaxial then i have a coaxial cable exiting the receiver from the "monitor out" to the tv. the dvd will play if i switch the tv to use the coaxial. do i have to do something to the receiver to get it to upconvert or does it do it on its own?
"Coaxial" describes the physical construction of a piece of cable, but doesn't indicate its function. A piece of coaxial cable can be used for video, audio, or data signals. Coaxial cable rated for 75 ohms is can be used for composite and component video cables, as well as for digital audio cable. What I need to know is which video output on your DVD player is connected to which input on your TV.
If, as I suspect, you're using a single "coaxial" cable from the composite video (yellow RCA) output on your DVD player, then chances are your receiver can't upconvert it and send it via HDMI. You would need to have component video outputs on your DVD player and use those to connect to your receiver.
FYI for future posts: Any time you're asking about connections and features it is always best to list the make and model number of every device that's in the mix. Your options are always constrained by the capabilities of the particular components you're working, and without the model numbers we can't research the devices to determine what those capabilities.
Then you're not getting the most out of your DVD player. The analog stereo cables will get you Dolby Pro Logic II (a kind of analog pseudo-surround sound) and a very inferior video signal. (Worse all around if you're using the cables supplied with your DVD player.)
You should be using a digital audio cable (75 ohm coax, get one from Monoprice or Blue Jeans Cable, you want better than the garbage thrown in by manufacturers, but there's no reason to go nuts paying Monster Cable prices when Monoprice and Blue Jeans are at least as good) to output digital soundtracks to the Yamaha, and the component video outputs on your DVD player to the component inputs on the receiver. Then the Yamaha will be upconverting from the best signal available from the DVD player instead of an inferior composite connection.