Who is your employer, that they would fire you because one of your (apparently) two usable computers is out of commission for a day? I don't know the specifics

Who is your employer, that they would fire you because one of your (apparently) two usable computers is out of commission for a day? I don't know the specifics of your situation so I could be wrong, but unless your employer has actually said "I will fire you if you ever have computer issues, grr!", your job is probably not in jeopardy. Shit happens, employers understand. (If in fact your employer is enough of a dick to fire you over this, then, ouch… good luck!)