If the correct paper size is loaded and there is an adequate supply of stapling cartridges, the next step is to verify the physical condition of the stapling finishing unit. A common issue could be a jammed or misaligned staple within the unit, which would prevent the mechanism from performing its respective finishing task. Examining the printer's internal stapling unit for jams is a logical and common resolution attempt prior to considering external servicing or part replacement. The choices of restarting the printer or replacing the network cable, while legitimate troubleshooting steps for other issues, are unlikely to resolve a mechanical problem such as a staple jam. Checking the power source would not fix a jam, as the printer is already powered on and reporting a staple jam error.