After fixing a problem, what screen should be checked to verify that there are no problems before starting the machine?

The most appropriate screen to check after fixing a problem, before starting the machine, is the Diagnostic Screen. This screen is specifically designed to display real-time status and diagnostics related to the machine's operation, including any residual issues or flagged problems that need attention. By reviewing the Diagnostic Screen, an operator can ensure that all systems are functioning as intended and that any previously existing faults have been resolved.

While the Startup Menu provides options for initiating the machine’s operations, it does not typically give detailed feedback on system health or error status. The Error Log can reveal past issues but might not provide real-time insights into current conditions that could affect the machine's startup. The Settings Menu is used for configuration choices and adjustments rather than for confirming operational readiness after repairs. Therefore, the Diagnostic Screen is crucial in reaffirming that the machine is ready for operation after addressing any issues.