If you didn't balance the props then they are probably out of balance. They almost always need balancing.
If you are willing to take responsibility of flying it in your hand, you can:
- TAKE PROPS OFF FIRST
- connect long USB cable to GCS
- connect flight battery
- go to GCS Output page
- click the Link box (right side of page) on all motor lines, 4 for a quad
- click the Test Outputs box at bottom
- click any one of the motor sliders to "give the slider focus"
- pressing Home will stop motors
- pressing End will make motors run full speed, I REALLY don't recommend you do this with props on, instead...
- pressing left or right computer arrow key will slow down or speed up all linked motors by a small amount each press
- hold down left or right to get there quicker
- now that you understand how it works and motors are stopped, put props back on in correct locations and tighten normally
- at this point, I put on a heavy coat (protect my arm) and a heavy glove (protect my hand) and grab the quad tightly by the bottom side
- press and hold computer keyboard right arrow key for a short time to get motors running slowly
- (strong enough to lift off yet?) press and hold right arrow key for a short time to get motors running faster
- when done, press and hold left arrow key to stop motors
- disable the Test Outputs box (no, don't Save settings)
Does it feel like it has enough lift to take off? Way before you get to full power? I so, you proved that it has enough power, so it is very likely that it is a prop balance problem. Is it pulling straight up or is it trying to twist out of your hand?
One last thing to test is that you can switch your transmitter on and go to the Input page (still need flight battery) and make sure that the transmitter throttle stick makes the GCS throttle slider move all the way from one end to the other (or at least way up past where you know it had enough power to take off. Obviously the quad must be disarmed when you are doing this...