Ceiling fan
Installing a new ceiling fan just as I have in the nearly 30 yrs of homeownership and helping family and friends. Turned power off at the wall switch. I know it’s better to turn off the breaker, and proceeded to remove the old fan and housing. When I got to the wiring I found two white wires intertwined. New install wants ungrounded white to go to red quick connect and grounded to go to white quick connect. When I separated the two it knocked power out after a tiny spark. Tried resetting all breakers but nothing, as it appears the circuit was interrupted when the two white wires separated. I’m lost. Any help is appreciated. Was thinking maybe intertwining the two whites again and braiding red and white from harness with wire nut but I’m not sure that is advisable. Hope the pic helps some. But I am likely calling a pro in.