*NOTE* If you DO follow all of my instructions and still get a black screen, something is messed up with your .minecraft folder, keep your saves safe, and delete the .minecraft folder, and start over again.
If you get a black screen follow these instructions! 1. Back up your saves folder (not located in .minecraft folder) 2. Delete the .minecraft folder 3. Open Minecraft and get .minecraft folder back 4. Repeat installing modloader.