Make sure the correct ink or toner cartridges are installed, and that the printer has sufficient ink or toner for your print job. Make sure no error messages or blinking lights display on the printer control panel. Resolve any errors before you use the printer. Restart the printer to clear any error states.
Assuming the printer hardware is functional (that is, not defective), then it may just be a matter of checking through a few things and perhaps making sure the network / printer connection is actually working as expected.
