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I use HDMI cables for my blue ray DVD player, not sure if you do. If so, make sure surround sound is connected to your TV in the right jack. My surround system is old, so only uses RCA's (red, white, yellow). I plug mine into the audio out jacks (red, white) just below the HDMI 1 jack. Only the red and white are required for sound but also can use video (yellow) for higher quality. That is the main audio out. Plug into that and you should have all sound that is on your TV also sent to your surround system.
use a straight thru to connect directly to the router. Cross overs are typically used when connecting PC's directly together or daisy chaning routers or switches. Try a different port on the switch? Also from a pc, go to the DOS prompt and try and ping your TV. If your TV IP settings are all correct, and your network equipment is working, your should get a response from pinging your TV. If you don't, I would suspect a problem with your TV Enet port.
Check and RE-SEAT the VIDEO connections on BOTH the DVD Player output jacks and TV input jacks (re-seating means remove and replug). Poor connections can cause this, especially if using RBG cables. Make sure DVD R (red) is connected the TV R (red), and the same holds true for G (green) and B (blue) jacks & cables. The G & B cables & jacks can look very similar in dim light. Do the same thing even if using HDMI or SVGA cables.
Your description is not entirely clear, so I have to guess a little here, but I think what is happening is as follows:
1) You are using your DVD player as the source for the CD.
2) Your DVD is connected directly to the TV and the TV then connected to your receiver.
If the above are correct, then the problem is that the TV only has what is called an ACTIVE passthru for Audio signals. This means that the signal is process by the TV and tehn sent to the audio output jacks. With the TV off, the buffer ICs are not functioning, thus no output. Some older sets have what is called PASSIVE passthru.
I don't know your specific DVD model specs, so check to see if you have 2 audio outputs from the DVD (many do) and connect the other audio out directly to the receiver. That will resolve your problem.
You will need to connect the dvd via one of the inputs on the tv then select that input on the tv to see the dvd. Since dvd can connect to the tv several ways I suggest you read the owners manual as they show all the hookups to the tv. If your dvd has an hdmi input that's the best output to use from the dvd player.