My 360 has Video but no Sound.

You can figure out real quick through isolution what the problem is and who to point the finger at. Go ahead and unplug your xbox 360 system and hook it up to another tv. It doesn't have to be hdmi, just a standard one can work fine so you can plug the yellow video, and two white/red audio cables in to test. If that works then you need to look at the ports on your tv or sound system as the source problem. Check the settings...it doesn't hurt to reset them and reconfigure. Also check the xbox system settings in the Dashboard and verify. That will get the ball rolling and get your solution asap. Good luck!!!

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when we experience a no video/display but with sound as if your logging in at your default blade, try to disconnect all the cables including the power cord and the audio video cable. (its the cable going from your console or xbox 360 to your tv). Before you plug it back try also to wipe the prongs or the metal part of the cables to ensure it has no debris or anything that would mess up the connection. If your using an HDTV make sure that the switch of your component cable is click on the hdtv settings. if it still not working for you, try to use a different cable and TV just to isolate the problem. If the issue still persist.. its the system that has a problem. Not exactly the hardware but it would definitely the prongs at the back of the console. So, bring it back to the retailer if its still in 30-days warranty or send for repair to its authorized service center.

Check to make sure the video selector switch on the video cable is set to proper position according to your type of tv. (TV or HDTV)
Unplug your cables and then plug them back in again.

You can also turn on your Xbox using the controller. As soon as it turns on hold in the right trigger and press the Y button. This will reset the video system settings.

It may be possible that you have a bad video cable but I doubt it.
If none of the above works you'll need to call xbox support to have your console repaired especially if it's still under warranty. If it's still under warranty, (under 1yr old for this type of problem) Microsoft will repair it for free.

ther is a switch on the cords on the end of that plugs in your xbox it has TV--HDTV make sur that the switch is but on TV

are you using a scart lead? If you are look here for adivse and a possible solution
http://support.microsoft.com/kb/909340
if not let me know

Check to make sure all your cable is plugged in all the way, and if you are using the HD cable, that it is switched appropriately (regular TV to "TV" and HDTV to "HDTV"). If all that is well, call Microsoft, your system is under warranty and they will RMA it.

Put the Hd video cable in the slot and put the regular audio cables in their slot. It should work then.

If you can still HEAR sound, but can't see. Check your Audio Video Cable.

It's the colorful one (red, white, yellow) (red, blue green, white, red)

Make sure the connections are secure into the back of the TV as well as the connection to the back of the Xbox 360.

Warrenty issue. Contact Microsoft to get this fixed. There a lot others having the same problem. do not take it apart. This will void the warrenty.

are you using original xbox games or 360 games