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
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Maybe you don't have Java.
Blue screen when playing online
All you have to do is delete your .minecraft folder and run Minecraft agian. It will make a new one, then try installing it agian.
it isnt No flippin' idea. The black screen, with giant white letters, it's very annoying.
if you installed a mod then do options force update on the login screen. if you did not have mods then you can do anything about the crash report unless you are a computer geek.