basroil, Thank you for your answer - I don't have a manual, but you motivated me to search on how to wake up an HP 2050 series. Found some other printer models with similar problems - but then noticed that the tech, who had recently worked on this two-computer setup, had plugged the printer's USB cable into the wrong computer. The printer should be connected to computer 'A' since the printer is shared out from that computer. Instead it was connected to computer 'B'. Both computers could 'see' the printer but couldn't print to it. I transferred the printer's connection to computer 'B' and the problem is solved. Thank you.