Yes/no.
Apparently the devs say that it runs best in java 7, so I tried it with both 7 and 8. Both times, it crashes/stops responding at the Mojang screen.
I've never used feed the beast before, but I'll give it a shot.
Don't take this the wrong way, but have you tried waiting?
With enough mods (I'm at about 58, for reference) the mojang screen takes 10-15 minutes to get to the main menu/splash screen.
If it takes even longer than that, it's a mod/computer issue.