Hello Zuhair,
Since you have already replaced your batteries, I would suggest that you check your connection between the mother board and the power supply. If your connection points and wires look good, then it is likely that you have a faulty motherboard that needs to be replaced.
You can visit the [[Vtech Kidibeats Drum Set Troubleshooting|Vtech Kidibeats Drum Set Troubleshooting Guide]] for more detailed instructions.