A printer may sometimes be easily corrected by turning the printer off and back on. The second typical problem is that the select/on-line light is off. Push the select / on-line button and the light should turn on.
Check the power cables, terminal cables are the loose? Is the a sheet of paper jammed? Note that the printer should be cleaned / vacuumed once a month with a brush or needle vacuum. On the Okidata printers there is a paper sensor underneath the left side of the platen. Sometimes that sensor gets jammed with paper particles.
