I have a brand new ceiling fan that seemed to work well for 2 months but now it needs a push to get started. Any easy fixes or should I try to return it to the store.

I'm trying to install a ceiling light fixture in a new construction condo. The condo has an existing j-box, but no existing light fixture. My new fixture has single black and white wires (the wires themselves are silver) and came with a metal strap that has a green screw for the ground wire. However, the ceiling wires are different from any of the configurations I've seen online. All of the ceiling wire casings are white, but are painted to differentiate them. One wire (actually a group of wires bundled together) is left white, another has red paint, and a single wire has yellow paint. I was assuming that the red-painted wires go to the black wire on the fixture, the plain white wires go to the white wire on the fixture, and the yellow wire is the ground, which should be connected to the green screw. Correct?