(1)Please check to make sure you have installed 1.5V 6*AA battery. Do not use inferior batteries as their voltage is lower than 1.5V. (We recommend brands like Energizer, Duracell, AmazonBasics, etc.). (2)Make sure the polarity is correct and the contact with the spring is normal. (3)Press and hold the power button for at least 3 seconds to power on. (4)If it still cannot be turned on after 1-3 steps, please try to use a power bank.