Before asking others for support, please remember that they need a reasonable amount of information in order to help. Depending on the issue, here's some important details to include:

  * What kind of LED's you're using.
  * What microcontroller board you're using.
  * What version of the FastLED library you're using.
  * What version of Arduino IDE you're using.
  * What OS you're building from.
  * A circuit diagram/layout (try using Fritzing to show it).
  * A copy of your .ino file (copy it to www.pastebin.com or gist.github.com).
  * Essentially, give us EVERYTHING in excruciating detail.
  * Provide specifics on how/where it's all being powered up.
  * That would be pins, voltages, power supply used. . . every . . single . . wire.
  * Try and remove all the superfluous code and minimize the amount of code that exhibits the issue.
  * Oh, and triple check EVERYTHING. Again!