WS2812B doesn't work

Hello guys, i'm doing a project with 412 addressable RGB Leds using arduino uno.

The problem is, all the wires are connected right, like the diagram down below but when i load the sketch, the leds doens't turn on.

i'm also using a 5v 20a power supply.

Not obvious exactly how you wired the LED strip.

Read the instructions - point 7 - to post your code.

Not sure whether 412 NeoPixels exceeds the memory capability of the fake (but just the same in regard to code) UNO. :roll_eyes:

Is the resistor only poked through the hole in the Arduino board? Or did you solder it? Same question with the ground wire.

I didn't notice that. It isn't actually connected? :cold_sweat: