Hi, I am Tech Michael and I will be assisting you today.
Please be patient as these are technical questions that may require a bit of conversation to solve. Also remember to be detailed in your description of the problem. That will help me make a diagnosis quickly for you.
Hi this sounds like the power adapter is still ok. But you would need a meter to be sure, or you could take it to Radio Shack or just about any hardware store and have them check the output for you.
If they say its bad, Radio Shack has replacements for this Also if you have Best Buy they may also have one. If that isn't an option local to you we Can supply you where to order a new power cube;-)
But please keep in mind this may be something internal to the keyboard that we can work on if need be or I can tell you the best place for repair if needed as well.
Since this will take a short while to be sure if that fies this, please rate my service to you kindly at this time. That will eliminate to possibility of your question timing out or closing unexpectedly;-)
Then you can contact me anytime on this to go further if needed there is no cost to rate.
Thank you and have a wonderful day!