Power Supply "not-present"

Hi,

a while ago I found out one of the power supplies is not present on BIG-IP 4200 (running 12.1.4)

I've had the PS replaced, I even got a photo of a brand new one in slot 1 with two shiny green lights, but TMSH still states:

Chassis Power Supply Status
  Index  Status       Current
  1      not-present  NA
  2      up           AC

Any ideas how to troubleshoot it further? Could reboot help?

I know the date and time of when the PS was replaced, which log file would indicate it?