mustarddd

Hello, Playing Tekkit Classic, i've been trying to make a password protected door using a computer. Unfortunately, it is very slow and alot of the times, unresponsive. I can exit the computer just fine and even type just fine, but as soon as i go to the edit startup, it becomes unresponsive. I have tested to see on my sisters laptop if it works fine, and it does. Any help? Thanks in advance :D