You might want to try a factory reset if you don’t need the data And, to the best of my knowledge you won’t need to prove that she’s gone (I could be wrong)
Hey mate! Had a similar problem with my mac pro! That bloke was a solid machine but one day it would not turn on, I cleaned the RAM and it booted fine! Had a bloody time trying to figure that one out but in the end it turned out to be simple! Cheers from down under! TC