Before you all get on your high horses, why not re-read the question and this time notice the sentence beginning "Before take off......". Like several devices on board aircraft today, a simple link to the WOW switches will tell it if it can run a test. Of course, to guard against malfunction the relevant circuit could also be isolated after it has run it's test.
It's all a bit far fetched, but then again so was flying not so many years ago.
There is no one chip at the moment (how do you measure fatigue?) but the ECAM/EICAS/CWP systems on A/C currently do a similar job, it's not beyond the realms of possibility that one day there could be a single A/C status chip.
As for disabling the A/C, I'm sure the system will have the MMEL/MEL/CDL programmed into it, if a no-go item is found then all it has to do is isolate the fuel system and the A/C isn't moving.
Rather than worthy of a tabloid, I'm guessing the 13 in the poster's name refers to his/her age, making it worthy of an inquisitive mind. And that's to be encouraged. Go for it.
edit for spelling. again! 