It can't be done with formula without creating a circular reference (infinite loop of checking if 0, if so make it 0, check again, make 0 again... etc)
It can be done using VBA Code though:
But I fear I've caused an infinite loop here too and not sure how to end it after the initial check... Can someone better with VBA than me please fix it? Hehe.
(Note you can use this one if you just hit the Escape key after a few seconds, so the code ends after only doing a few loops, everything will be 0. But I'm sure it's an easy fix to remove the infinite loop.)
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