Let's keep it simple then - lets assume something jammed your z switch. Turn off power on the UM2 and if the bed is down low then raise it by grabbing it towards the rear and lift firmly so that it goes most of the way up.
Then look under the bed and you should see this long screw sticking down below the bed. Very long. Then imagine the bed in the "down" position and look at the hole that screw would normally stick into. Examine that hole carefully. You might want to tilt the UM2 on it's side and look at it from the bottom. Take something pointy and stick it into that hole and you should hear the click of the Z limit switch. Did anything fall into the hole and jam it up? Or was it already working?
This is the first test. If this doesn't fix the problem then maybe post a video of what is happeneing please. Make it very short. youtube is ideal for posting videos so please use that if possible.
swarly - please follow your own topic - click "follow this topic" in the top right of this post.
Well something seems to be wrong - not sure what. Either the Z homing switch is not working possibly. Or the Z axis isn't moving the right amount possibly. To diagnose a little further, get pronterface here:
Hook a USB cable up to the printer and connect using pronterface. Then play with the Z axis - try homing it a few times. It shouldn't slam or make horrible sounds. You should be able to hear the Z limit switch click when it hits the switch. This is the Z=0 position.
If that seems to be moving, then try moving with G0 commands. For example:
That moves the Z to position 5.1mm. That means 5.1mm below the nozzle. Try moving back to z=0. It should be repeatable - perfectly. Unless something is loose or defective. Also try measureing the distance the bed moves - maybe over in the corner with a ruler against the frame.
If you can narrow down your problem to something more specific that might be helpful in diagnosing.
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