2 motors won't spin beta flight

Installed new rig. While in beta,
motors 3/4 spin …1/2 no spin. double checked sod. joint…no issues. Wire harness good pin header …Good. Any ideas?
Can’t get blheli to work still just get blank page so I can tell what’s going on…Help Guys.

VAN

Please see:

what hardware you got?

FC, ESC…
Can you post pictures of your FC/ESCs

Some more info will be helpfull, but also, have you connected the battery when connecting via BLheli, otherwise it will not detect the ESC

Also make sure you have the correct firmware on your FC, as if you have the wrong version it can sometimes not work properly.

But providing some more details on what FC, ESC you are using along with what firmware you flashed and some photos will let us help you further.