My RCA stereo system (model number RS27671-A) stopped working. I'm not sure what happened, but no sound is coming out. I tried reattaching the wires for the speakers back into the big thing, but that didnt work. I tried plugging headphones into the main thing, but no sound was coming out. So it's not the speakers its the main part. Is there anything I can do to fix it?

SOURCE: no display or sound

Definitely looks like Poweer Supply problem. But as there is some display on the Front panel, It definitely is not the Power transformer. But it seems like some component in the Power Regulator circuit has either short-circuited, or has become open circuit. Nothing a layman can do.Seek professional advice. BTW, you hav not mentioned if any of the operations are functional (Play, REW, FF, etc)

SOURCE: speaker doesnt give sound

Based on the fact that you have put a headset in and another speaker system and it is working properly there is nothing wrong with your windows settings. I would leave them alone. The issue appears to be with the hardware. Have you attempted to plug the speakers into another source (ie. cd player, ipod, etc)? If you plug them in there and they don't work, take the speakers back and have them exchanged. If they're not under warranty you're going to have to either get them fixed or replace them. Good luck on this one! JC

SOURCE: Macbook Pro Right speaker isn't working

I hate to break it to you, but it sounds like a hardware issue. Have you tried going into System Preferences yet? If not, go to System Prefs>Sound>Output tab and then check the speaker balance. If the slider is in the middle, then it definitely sounds like a hardware issue.
I'm going to guess you've had your MBP for a while now, which would mean that something inside like a speaker wire could have gotten knocked around enough to just fall off, or loosen a connecter just enough to make the speaker not work. That is, of course, if it is not System Prefs. Let me know how it goes.

SOURCE: Right speaker doesn't work

I had this very same problem and I had my system for about 2 weeks. I have seen a lot of similar posts on this site so it seems that this problems happens a lot. For some reason my right speaker just stopped working so i came to this site for help. I looked at alot of posts and nothing fixed the problem. when i switched the right speaker to the left input it started to work so I knew the speakers were fine. So i finally decided to unplug everything and restart my laptop. Once my laptop rebooted I plugged the sub back into the wall after about a minute of it being not plugged in. Then I plugged all the the wires and volume control back into the sub and turned the switch back on. Make sure the volume control is down when you plug everything back in. Then plug the wire into the device, which in my case was a laptop, and start to play some tunes. Right away everything was working perfectly fine again and no problems ever since...for me atleast.

HOPE THIS HELPS

SOURCE: No sound coming out of speaker, but headphone jack works!

Hi, I had the same exact problem. The speakers wouldn't work but sound came out of the headphone jack. 
To fix my problem, i opened up the subwoofer unit and checked the fuse on the circuit board which seemed fine. Then i had a look at the wiring on the other side of the circuit board and noticed one of the wiring had fried leaving a gap in the connection and exposing the copper wiring. So i just soldered the two bits of wire together. Works fine now!  I just had to be careful when i finished soldering that the exposed wire wouldn't touch any of the other connections. I insulated the wires with a glue gun to keep it all in place.
hope this helps.