That "GPS" image would appear to be an actual GPS as opposed to a GPS antenna, one would connect via coax, one would connect via something like a 5 core cable. As the other images mention a baudrate (115200) then I m suspected your GPS is cable connected, not coax connected? Yes or No?
If cable connected then the first thing to eliminate/check is the power supply to the GPS, "unplugging it from the box", what box?, what cables? Is there a fuse somewhere?, Is there a power supply somewhere? Did any cables, like data cables get somehow crossed over?
If it was working before you "unplugged" it then it sounds like it has not been plugged back together correctly?