Pixhawk com port not showing

Hi there I am having some problem with my pixhawk, it was working all fine but when I powered it up using power module it started giving some problems

  1. on powering up it is giving main rgb light continuously red
  2. Both power lights of fmu and i/o are still
  3. On connecting with mission planner the com 16 port is not visible
  4. When I insert the SD card with my SD card adapter on my pc the SD card is also not visible on my pc

Can anyone please solve my problem, I guess my power module was faulty, though I didn’t checked it in the start but the controller was working fine when it was plugged with data cable with mypc also the buzzer is not working and safety switch is not giving any light