The one you don't have ( and can't get) a replacement for.
It's the fundamental law of inaccessibility: Every carelessly dropped object will roll to the point of least accessibility; down a drain, under the sofa, into the lion enclosure just before feeding time.
Water does this... it drains away.
Fabulously attractive and available girls do this also. One minute they are there hanging on your every word, next minute they've disappeared with someone far richer and more attractive.
Clean socks, forks, good friends and useful multi-purpose tools do the same thing.
Science calls it 'entropy'. Most people call it 'sods law'.
Even if you can obtain a replacement for every part of your computer, something, perhaps the 'on button' will break and your will be plunged into the DAW equivalent of the dark ages until such times as you can find a fix for it.
tB.
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