What does it take to "reset" a 777?
Saturday night I should have been flying a BA 777 from San Diego to Heathrow but instead after a long delay the flight was canceled. Before we were deplaned I got to speak to the captain and he told me that there had been some information from one of the engines missing on the computer and although an engineer had cleared the plane, during the takeoff roll the warning had come up again and we couldn't depart. After trying lots of things the idea was to power off and on the computer which would take "about 10 minutes", so we all got off to wait. About an hour later the ground staff told us that the engineers were now "resetting the plane" and they'd keep us up to date. Another 90 minutes later we were told the flight was canceled as we had passed the 1am takeoff curfew.
So I'm curious how long should "resetting" the plane take ? Is it a 30 minute thing, a multi hour thing? The plane did eventually leave for Heathrow Sunday night (presumably empty) so whatever was causing the error must have been fixed but I'm just wondering if the engineers hadn't realised how long it would take, or there was a lot more going on.