My Ign is DrTurtle. My computer is a mac running OS X El Capitan Version 10.11.6. I have 16 gigs of ram and normally run minecraft at 300 fps. The technic launcher works normally when I use other mods but when I try to use OK's mod pack it doesn't work. It opens a minecraft window and it's loading, when it gets to mid 50% it closes. Anyone know anything?