My screen is flickering purple and cyan My screen has a bunch of purple and cyan flickering bars on it. Does anyone know if there is a fix for this? I have tried resetting my nvram. I closed my lip for 15 minutes and then when I opened it, these lines appeared. I also run a diagnostics, but there were no hardware issues found.
Sorry to say that looks an awful lot like a hardware error.

It could be a bad video card, issues with the screen itself or the connection between the two (cables, connectors, etc.).

If you boot into recovery mode is the issue still present? That would rule out an issue with your OS if it is still there.

My advice, seek the help of a qualified Apple tech. Either at an Apple store or a good 3rd-party Apple certified repair center.