Answer to: How do I fix my Drone that won't lift off?On a lot of these toy grade drones if you get hung in a tree and the transmitter is still throttle up you are going to burn out something. I had issues when I was new to the hobby, so I feel your pain.
Answer to: One rotor isn't spinning fast enough for take offThe motor or the ESC is bad. The direction that it flies to is the bad one. If a brushed motor on a toy grade quad replace the motor.