Which of the following troubleshooting steps is applicable when trying to resolve a printer that won't pick up paper?

When troubleshooting a printer that isn't picking up paper, inspecting the tray’s sensors and guides is a critical step. This is because the paper pickup mechanism relies on proper alignment and functionality of these components. The tray often contains sensors that detect whether paper is present and its size, as well as guides that ensure paper is fed correctly through the mechanism. If there is a malfunction or obstruction, such as dirt, paper jam, or misalignment, the printer may fail to pick up the paper.

In this context, while checking the power supply, inspecting the print queue, or restarting the computer may be relevant troubleshooting steps for other printer issues, they do not specifically address the mechanical and alignment components involved in paper pickup. Therefore, focusing on the sensors and guides within the paper tray directly addresses the root cause of the malfunction affecting the paper feed.