Pixkhawk 2.4.8 won't arm

I have watched more videos than I can imagine and tried everything I can think of. The pixkhawk 2.4.8 simply won’t arm. I have simply never been more frustrated in my 20+ years of RC use and 10 year of Pixhawk use. I simply don’t know what to do. Any help would be appreciated.

How can anyone help if you don’t show any details.
Do you have a copter, a plane , a boat , a rover ???
Which Firmware are you using?
Which PARAMS?
Which HW you have additional to your pixhawk?
How you tried to arm.
Instead of watching videos read the basic information given on the Ardupilot wiki regarding your kind of drone

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