The phrase "not working" can be used as an adjective, for example:
My laptop is not working.
What is the noun-form of the adjective "not working"?
E.g. "The not-workingness of my laptop."
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Inoperability could be added to the list of candidates.
Granted, in medicine, inoperable describes being unsuitable for surgury without undue risk (as in, an inoperable tumor).
However, inoperability has another meaning; which Collins describes as the state of being unworkable, or incapable of being operated. TFD lists it as the noun form of inoperable, which means not functioning or inoperative.