Don't have a clue

I’m new to this game . and it looks like I won’t be in it for long I just bought a pixhawk 2.4.8 but when I fit the neo blox 6 gps/compass it won’t power up. if I disconnect the gps and leave the compass it powers up.

check your cables, and try with another gps unit

I would double check cables and wiring diagram, specifically cables into GPS. Sounds like a short.