Some questions and diagnostic steps...
1) What kind of document are you trying to print? Application?
2) With the printer connected and turned on, what is reported by the following?
3) Did you check the CUPS error log yet? Any errors reported?
Code:
cat /var/log/cups/error_log
4) If you print to file first, then attempt to print that PDF document, is the print job successful?
5) You could also run the HLIP diagnostic utility...
Examine/capture the output, copy to
http://pastebin.com/ and post the link to the content here for others to review further.