Help me plz

OK so i pretty much am looking for a couple things.

A: Is it possible to keep a computer on and running automatically, like when server resets the computer turns off then
i need to run the program onto the monitor again

B: I want to make a clock that is on 24/7 like auto turns on but cant do it without A, but maybe there is a forum post
that shows a program code that keeps it on after a server reset or turns itself on automatically

thats it for now, i want to get into more complicated stuff but i need to figure out simple stuff first
thanks for help ahead of time

A: Put your code in a file called 'startup', so do 'edit startup' from command line.

B:

while true do
  local time = os.time()
  local timeFormatted = textutils.format(time, false)    -- change false to true for 24h format
  print( timeFormatted )
  sleep(1)
end

That prints the current time every second. You should be able to go further on from this. :)/>/>
that prints

The computer should boot fine if it was on when the chunk it was in was unloaded. It will also run its startup file, so simply place code in there to start your program running on the monitor again.