Hi everyone. I recently purchased a refurbished v2. Initially everything went fine. I quickly became tired of leveling the bed and decided to switch to the yellow bed springs. I replaced the plastic extruder with the silver all metal extruder at the same time. After changing the parts I was able to home and tram the bed for printing, once. The print was bad so I stopped it. When I came back later on to try again, the print head just starts punching into the print bed while trying to home. I replaced to stop switch with a new one. Same thing is still going on. Maybe I need to open the panel concealing the board and check connections? 

 I've looked for answers all day and am coming up short. I don't want to send it back. Can anyone offer suggestions as to what I can do to fix the problem? 4.2.2 board with no bl touch. Thanks.