I've replaced the gasket and screen of my bialetti and now it won't work. It burns the coffee and only manage to spit out a little bit. This seems to happen every time I replace parts but seems to fix itself with a few attempts--this time I've tried a number of times and still no coffee help!

The same thing happened with mine. Try replacing the screen cup, which can get dented and create gaps for steam to escape. The other trick when using a new gasket is to brush a little cooking oil on the screw threads, tighten it down pretty hard, and use a high flame. It's really hard to undo for a while, but after a half dozen times the gasket has expanded enough so that you don't have to do this.