IC2 can't get past the launcher

Hello all,

I've been trying to install IC2 off and on for months, but whenever I try, I've been getting a peculiar crash. Lately, I've discovered the joy of forums, so I decided to come here for help.

The crash, as described as best I can, goes like this: I install IC2 in the normal mods fashion (get the jar file, drag and drop into forge's "mods" folder, play), but whenever I try to launch the game, the launcher disappears for half a second, only to reappear that half-second later, leaving a heap of gibberish in the development console. Has anybody seen this before?

I can provide almost any information needed, but you'll need to be specific in your instructions, because I'm not good at following them.

Thanks in advance!!!

(PS: Stuff I know you'll need right off: yes, I ran forge before installing IC2; forge version 1.6.4-Forge9.11.1.965; industrial craft-2_2.1.440-; it's the only mod I have installed at the moment (will add more later); MacOSX 10.9.)

Oh, that's... that's, uh... really embarrassing. Ok, it works now. How do you know which are for 1.6 and 1.7???

Oh, so it's the 2.(something) that determines it. Ok, thank you!