Simply learn yourself.
For wifi

What to do when there is no light in AirPort

So, you just tuned on your airport router to connect to internet and suddenly you realized that no light is blinking. Don’t worry this instruction page will guide you in case you are facing the issue. Generally, AirPort comes in two variants AirPort Extreme and AirPort that assist in accessing internet on your Mac computer or iOS device.  Here are some steps that will assist you in case there is no light in AirPort

Step 1:  Firstly, check the power outlet and ensure that there is no short circuit. Also, check the power cable and make sure it is correctly plugged in.

Step 2: Changing power adapter is good option.  If you have spare one then replace it with older one. Unplug the power cable and then plug it again.

Step 3: If still it is not turning on, that means it might have some hardware problem. It is advisable to take your AirPort to apple store in case all steps fail to troubleshoot the problem.