Instructions
Flip the drum set over to click and remove the battery compartment cover; check the batteries to see the dates they were installed. Remove the batteries, discard them and install a fresh set of AAA batteries. Power up your console and see if the situation is corrected.
Check all the corresponding cords and USB connection to make sure they are secure in their connections. Even if there is only a partial connection, the drums will not power up when the console is on.
Press the sync button on the front of the console and the drum set simultaneously. Doing so links the two components together and allows the Xbox to "recognize" that the drum set exists.