The whole world would be in crisis if such a thing happens. communication would crumble down as well as the aircraft and subway transport. All the people in the life machines would die so the medical field would be terribly shaken.
Everything goes manual. Typewriters will be back. Longer lines in cashiers. No more credit card purchases. More people will get jobs. I remember once I saw my office mates playing cards during working hours. I asked them what's going on. They said, "We are playing manual. Computer solitaire is down.