Home will cause the z stage to move up. Sounds like stepper wires may be the wrong way around? does the print head move to the front left corner ok? if it doesn't, it may be that the steppers are plugged into the wrong stages on the control board (i.e x is plugged into z or similar).
Z home is down, not up. If you home Z and the plate is not calibrated (too high), the nozzle will crash on the plate, hence the ugly noise I would guess.
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