Inactive servomotor

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Hello, I have a 1501 MG servo and another (6001 HD) that I control with an Arduino board. I fed with a 4.5 volt battery. When I put everything in place, only the second motor moves, the first only makes noises inside. By cons, if I replace the first motor HD 1160 A, there is no problem. I tried to use a power of 5.72 volts but it changed nothing. Does anyone know how to fix this? thank you

That first servo is a high torque servo needing perhaps 3--4A supply. Do your supplies provide enough current?