Sony BDV-370 DVD/5.1 theater hooked to Sony Bravia TV and cable box. No sound comes from rear or center speakers with HD cable.

Not all Hdmi cables have same capabilities. Check out:
http://www.hdmi.org/consumer/finding_right_cable.aspx

you will have all them all in user manual itself right?

How have.you connected the TV to the surround unit ?

You need to use a HDMI 1.4 Cable and it needs to be connected to to an HDMI socket with an ARC (audio return channel). Alternatively you can connect using an optical cable (TOSLINK).

that is the simplest way. please rate, thanks and have a good day

Could be a sync calibration issue. Try to divert the TV sound to another input source on the Hometheatre system if possible, if it is a go then maybe the TV audio needs to be recalibrated. Make sure TV audio setup menu option has not changed also.

Hi,
You have connected from PC to TV right???
1.To get the video you have to connect to TV
2.Please take a separate cables for to listen audio and to watch video,
for audio connect cables from DVD Player to Home Theater you can listen the audio
for video please connect the HDMI video to TV Where You can enjoy both.

The fiber optic port on back on your bravia tv is only for when your using a over the air antenna and watching local atsc channels in your local market. You need to run the fiber optic from your hd cablebox if it has one or your hd sat box if it has one. If you don't have a set top box with the fiberoptic port on it you can use a digital coax cable from the cable or sat box to sound system. The only other way to get sound if you don't have a cable or sat box is to run the red and white rca audio cable from the tv to the sound system and got to the audio setup on tv and turn the tv speakers off and you might have to adjust the audio to fixed instead of variable.

I’m happy to help further over the phone at https://www.6ya.com/expert/brandon_60dfebff379d64bd

Sounds like it's just in 2 channel stereo mode, only 2 speakers working out of 5 and a sub, look for a selector switch for switching to 5.1 surround, as far as the no video problem try replacing the cable for the video connection. 

In short, the answer is: Hook up all three to each other. I have a Samsung DLP HDTV, and I was trying to hook up a Sony DAV-HDX500 home-theater system and a Comcast HD set-top box, but I found that the Sony user guide is helpful only for setting up the speakers. Most of what it had to say about HDMI and getting the TV sound or cable sound to go through the speaker system was wrong (or, at least, it didn't work for me). So, here's what I did. I connected Component video cables (Y/Pb/Pr out) from the Cable box to the TV (Y/Pb/Pr in), audio cables from the Cable box (audio out) to the Sony system ("SAT/Cable" audio in), and an HDMI cable from the Sony system (HDMI out) to the TV (HDMI in). This allows me to 1) watch DVDs with surround sound through the TV's HDMI source (when the "DVD" format is selected on the Sony system), 2) watch cable with surround sound through the TV's Component source (when the "SAT/Cable" format is selected on the Sony system), and 3) watch cable WITHOUT the surround sound, as I did before I ever had the Sony system. One item of note: When watching a non-HD channel with the surrond sound on, the audio is slightly out of synch with the video; thankfully, there's no such problem on HD channels. Anyway, I hope this helps. It drove me crazy for two days straight!