At ramp start your throttles are set to OFF. Setting them to IDLE is the part of the engines start procedure. LAlt+Home sets left throttle to IDLE, LCtrl+Home does it for the right throttle. Before moving any throttle to IDLE, be sure that APU is started, electric battery and inverter are ON (and STBY respectively), and fuel pumps are ON.
Stick can not move in certain directions without hydraulics.