Did it work before loading mods? It's highly recommended to start an empty Forge install once before starting any mods, lets Forge sort itself out a bit. If it is crashing after that, you might try removing all the mods then adding them one at a time to see which one is the culprit. You say you did this, but it shouldn't be "random." Either it'll work or it won't. Don't add more than 1 mod at a time, and start/exit each time.
Are you saying you load Forge with mods, it works, exit, reload the same exact thing, and it doesn't work?