Welcome to the FliteTest forums.
More details are needed.
Have you connected the flip to a computer?
Are you running Baseflight, Cleanflight, Betaflight...?
Copter boards need to be armed. Most of us program a switch on the transmitter. Old school (and the flip 1.5 is pretty old) is to put the throttle at 0 and then full left yaw to arm. Throttle at 0 and full right yaw to disarm.
Please, do not power your copter on the bench with props on.
