before you ask
My motors are not spinning anymore ?
One of the most important things to perform when building your drone is to make sure you calibrate your ESC's. You need to complete a calibration whenever you use your ESC's on a new system to ensure that they output the correct minimum and maximum power to your motors. Please also recalibrate the accelerometer.
My quad just flip and crash when i push the throttle up
This is mostly due to inverted motor channels or inverted motor rotation.
My quad just doesn't start.
Have you armed it ? Have you checked your radio RC channel range ? The min-throttle value must be set. Also recalibrate the accelerometer.
I can't connect the Z-CORE to cleanflight
Have you installed the cp210x driver ? Have you removed the jumper on the FC ?