If your electric scooter isn't turning on, it could be due to several issues. Common causes include a dead battery, loose or faulty battery connections, overheating, or a damaged battery. Charging problems like a faulty cable, defective charging port, or overcharging can also prevent startup. Additionally, motor malfunctions such as a broken motor or overheating, as well as issues with the motor controller or blown fuse, can affect performance. To troubleshoot, check the battery, connections, charging components, and motor for damage, and consult a professional if needed.