you probably haven't downloaded Java Runtime Environment.
no its lag, computer fing up, or just java (the answer above) have you resarted it tho?
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Maybe you don't have Java.
The black screen means the mods you have installed are either incompatible with the game or with each other To fix this you have to force Minecraft to update minecraft.jar, which will uninstall all your mods: before you log onto Minecraft click Options, click on Force update! and click close and log in as usual
it isnt No flippin' idea. The black screen, with giant white letters, it's very annoying.
print screen key on keyboard, if you have steam, you can run minecraft from your library and use the steam screenshot system.
Minecraft Forge lists you all mods in minecraft and Forge