Computer Breakdown, Restaurant Closed

Do you know what is the impact of Information Technology (IT) can have on your business? I think the impact could be very drastic because I saw this pizza restaurant at Berjaya Times Square closed since yesterday. All the staffs are there, but there is this A4 paper placed at the center to the entrance saying 'Closed, Computer Breakdown'.

Could't take a clear shot on the notice at the center because the staffs are looking at me...anyway, it says ' CLOSE, COMPUTER BREAKDOWN'

Today I saw some technician fixing something near the cashier.

See how important is IT in business, even a pizza restaurant that serves food and beverages, cannot operate because of computer breakdown. I wonder what roles does a computer does, that can caused the entire restaurant to come to a standstill.

Is this a norm to all the F&B outlets to close if there is a problem with the Point-of-Sales (POS) or 'computer'?