Unfortunately the grinding sound was probably the stepper motor slipping. (It’s not going to hurt anything in itself, it just sounds lousy.) 
That can either be caused by debris in the track or slipping of the belt or the head actually hitting something physically. Once it gets out of whack, the rest of the cuts are going to be out of whack.
I would recommend inspecting the belts and tracks closely, particularly the one behind the printhead, with a flashlight. Look for debris on the tracks or anything that might have caused the skip.
If you don’t find anything obvious, you should probably follow these instructions by @pip on a sheet of Proofgrade draftboard (or any proofgrade material) to gather the information that support is going to need to troubleshoot the machine.