Final Answer:
The first thing to do to solve a hardware problem with the network router is to check that the power supply is working. Option 4 is correct.
Step-by-step explanation:
Ensuring the power supply's functionality is crucial when troubleshooting a hardware issue with a network router. Start by checking if the router is receiving power by confirming if it's properly plugged in and if the power source itself is functional. Look for indicators such as lights on the router that signify power. If there are no lights or signs of power, try using a different power outlet or a different power adapter if available. Sometimes, power fluctuations or issues can affect the router's functionality.
Once you've confirmed that the power supply is functioning as it should, you can move on to further troubleshooting steps, such as checking physical connections, verifying cables, or examining the router's settings. But initially, ensuring a stable power supply is fundamental to resolving hardware-related router issues.
The correct answer is: 4) Check that the power supply is working.