If the sick or injured person does not respond and is unconscious what should you then do?

You would check the ABCs, and call 911 or yell for someone to call 911. The ABCs of first aid are:

• A = airway, is the airway clear
• B = breathing, is the person breathing
• C = circulation, is the heart beating, does the person have a pulse

An unconscious person is at risk of a blocked airway from the tongue moving back into the throat, or at risk of vomiting and aspirating (breathing in) vomit into the lungs. Both of these are life-threatening. So as soon as you know a person has the ABCs intact, you need to roll the person onto his side. To protect the spine, you'd keep the person's neck straight and supported and roll the person as a "unit" or like a log. As long as the ABCs remain intact, you do not need to do anything else except wait for the paramedics. Stay with the patient. When paramedics arrive they will need you to tell them what you saw/what happened, and what emergency steps you have done.