Final answer:
The technician should first check the power cable connection to see if it is securely connected to the workstation and power outlet.
Step-by-step explanation:
The first thing the technician should do in this situation is to check the power cable connection. It is possible that the power cable may not be securely connected to the workstation or the power outlet. This can prevent the PC from receiving power and cause it to not power on or show any signs of activity.
By checking the power cable connection, the technician can ensure that it is properly plugged in and that there are no loose connections. If the power cable is indeed loose, reconnecting it securely may resolve the issue and allow the PC to power on.
If the power cable connection is not the issue, the technician can then proceed to other possible causes such as testing the voltage of the PSU with a tester, checking for distended capacitors, or checking the voltage switch.