PFD & FMS will not come on
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Can you confirm that all the switches on the top row of the AVIONICS panel at the top left of the overhead panel are in the ON position, and the aircraft is being powered either via the APU or GPU (no amber annunciators should be visible on the ELECTRIC section of the overhead if so).
If the PFD and FMS electrical sources are powered but the PFD and FMS are still powered off, then that could point towards an installation/activation issue. In that case, could I kindly ask you to raise a ticket with Just Flight Support via the following link: https://www.justflight.com/support
In the ticket, if you could let our support team know if you received any error messages when installing the aircraft, or on the EFB/tablet after loading into the aircraft, then they will be in the best position to assist with further troubleshooting.
Mark - Just Flight