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Assuming you have never had it working before, then it's likely that you have got a setting wrong.
Not knowing the make or model. What I suggest you do is do is find the speaker test settings. There should be an option to send a tone to each speaker. This will determine if you have connected the speakers right. It will tell you which speaker is being tested. If you can't hear the tone, then the speaker is not present or connected right.
Once you have done and if you still can't get sound. Try a simple stereo test source such as working CD player or tape deck. Connect to a socket and select the device function setting CD etc. Set it playing.
Do that for every device function one at a time. Follow the settings in the manual and you should get the thing to work.
If you are trying to play a cd, you must manually tell the unit to play it in surround sound. Cd audio defaults to stereo only. Does it do the same thing if you are playing a dvd? If it happens on dvd's as well, then something in the speaker setup menu is wrong.
If none of this helps, I suggest making sure your wires are correctly connected from your CD player to the speakers. Also, make sure no exposed wires are touching, it should make an audible hiss if they are touching anywhere. If none of this helps, then I suggest taking it back to where you got it, may just be a dud.
Your FM tuner will only generate sound from the front sepakers. CD's, Tape, and I guess mp3 player, as well, will only play through the front speakers.
I've included a link for the manual. The audio on this rig is pretty complex. read through the info, especially pages 11,12,13, and play with the audio controls. http://support.radioshack.com/support_audio/doc61/61792.pdf
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.
The usual fix for "Speaker err" message is to simply unplug the sub-woofer power cord to reset the speaker diagram, plug it back in and remember to "match the negatives to negative, positives to positives" and never try to replace the original speakers with anything but equivilent speakers, adding on more speakers can cause the "Speaker err" message and an inoperative system.