Final answer:
The initial step when a customer sees 'One Moment Please' on their TV screen should be to ask them to power cycle their set-top box, as this can often resolve temporary communication issues. If this does not work, further account checks may be necessary.
Step-by-step explanation:
If a customer's TV screen displays the message 'One Moment Please', it typically indicates a temporary communication issue between their set-top box and the cable or satellite provider. Before scheduling a technician which can take time and possibly incur costs, the most immediate step to troubleshoot this problem would be D) Ask the customer to power cycle the set-top box. This means the customer should turn off their set-top box, unplug it from the power outlet, wait for about 30 seconds, and then plug it back in and turn it on. A power cycle can often resolve temporary issues by resetting the device and reestablishing communication with the provider's network.
In addition to this immediate step, it can be helpful to check if the customer's account is paid and current, and verify that they do subscribe to digital service, as these factors can also influence the functionality of their service. However, these checks can be pursued if the initial power cycling does not resolve the issue.