My Technic Launcher keep crashing when i try to play any mod pack

[chrispin]

When ever i try to play any mod pack as soon as i click launch it starts up but then it stays at the black screen i have tried completely removing the folder and re downloading it i have tried using a different account i have also tried messing with some of the coding but eigther way it doesn't work idk what to do i'm stuck please help.

I am also using a imac idk what gen

[Munaus]

Knock Knock!