GPS not found on mission planner

I’m having trouble connecting my gps module. The mission planner does not recognize the GPS and the Gps Not Found message appears. if someone can give me any help, I appreciate.
GPS: Ublox-NEO6M
Frame: f450
Motors: LHI 2212 920KV
Esc: 4x SimonK 30A
Pixhawk: 2.4
Receiver: 9x turnigy
radio: 9x turnigy
battery: 3s 5000mah 40C