Lexmark MS517
Try one or more of the following:
Note: Make sure the paper size and type settings are specified in the Paper menu on the control panel.
Lexmark MX/MXxxx, MB/B2xxx, and XM/Mxxxx: Unable to Load Paper into the Multipurpose Feeder (MPF)
No pick or ‘Load Tray 1 with specified paper’ message appears even when the tray has paper in it? See this article on how to troubleshoot.