If the motors will not start then the battery may be defective.
If the drone is still under warranty it will cover a faulty battery.
Can you test what voltage is getting to the motors?
Or tests the motors using a direct voltage source - if they still won't start then the motors are defective.
No, the motors should still run without GPS.
Hi, you will know if the drone responds to the transmitter's commands.
You can test the motors with an independent power source to check if they are working.
You can test the motor using a cordless drill battery or similar battery.
See this useful guide: https://www.youtube.com/watch?v=0Y1We0TLCbE
If the polarity is not marked on the motor, you can use a voltmeter to find the positive and negative connections.