Can you give the complete sentence? Something is missing. Do you really mean romper as in break or do you mean abrir? I sometimes feeling like smashing my computer, but I know it wouldn't help.
To crack something open can mean two different things:
1) to open it "just a crack," or open a little bit, as a door or window.
2) to break it open with a sharp hit, as an egg. I think you mean #1 for a computer!