What do you think would happen if a company's computers were turned off for one day?

It depends how reliant they are on the computers. If their business simply uses the computers to keep their accounts up-to-date - they would simply wait til they were turned on again, and update the accounts manually from paperwork. However - if the business was reliant on computers for tracking vehicles, or displaying essential 'live' information - then the business would stop (and lose money) for the time the computers were unavailable.