Samsung 20" sync master

Yes, it's called dead batteries.

Replace the batteries with new ones, and then just turn it on. It shouldn't be necessary to sync it to the xbox, unless yuo have synced it to another xbox lately.

The sync button on the console is right next to the memory unit b slot on the front of the xbox 360. The sync button on the 360 controller is on the top between the two bumper buttons.

You might have to replace the batteries in the controller, as if the battery life is low the controller will have issues syncing to the xbox 360. Just in cause, To sync the controller to the xbox 360, you must turn on the controller using the xbox guide button and then press the Wireless Sync button right next to the Controller Charging Port. Then you must press the sync button on the xbox 360. You must do this semi-quickly, or the sync process will not complete.
Lastly, You also might have a faulty controller, I suggest you go back to the store you got it from and see if they will replace the faulty controller.

If the controller is brand new, you need to Sync it with your XBox 360.

Turn on your 360 using the button on the console.
Turn on the controller by holding the X button in the middle.

With both on, click the SYNC button on the xbox 360.
Then click the SYNC button on the Controller.

The green ring around both should flash a few times, then the upper left quadrant should light up on both meaning it's Sync'd.

Enjoy.

That is a syncing Issue, Try this, it may take a few tries. Press the Sync button on the Xbox 360. Then press and Hold the sync button on you Guitar for 1 Second. The Xbox and Guitar Should Sync.

if your wireless controllers wont sync to your xbox, it could be one of 2 things.

assuming your batteries are fully charged, and that you're using a certified xbox controller, it could be that the controller itself. it is really rare that the wireless receiver inside the xbox itself, goes out, but soemtimes, it happens.

the easiest thing or you to do would be to either pick up an after market controller, or another certified controller, and see if they'll work. if you try other controllers, and they STILL dont work, verify that your system settings are correct, or are set to default, and make sure that your xbox isnt sitting close to something that could be interfering with the signal....like a wireless router for example

if this doesnt work, then it's a problem with the xbox, and you should send it back to the service repair center.

maybe the only way is take it a part and see if the sync button is not broken some how. therefore i advise you to buy a new controller maybe even a used 1 if you dont want to spend more than $20.

Ok, when you sycronised the guitars, you pressed the sync buttons on the guitar AND the console? Is the faceplate spraypainted or obstructed from wireless signal?

press the synce button located on the front of the console. then press and hold the synce button on top the controller. the lights should tell you that the controller has been connected

i have the same problem as well
wtf?
i used mine for ages then suddenly last night i looked all cell shaded and swirly so i left it over night. i turn it on this morning and get mode not supported. i thought it was my xbox but now i know it is the tv. thanks for at least that much. someone please help