There isn't enough to go on to provide a definite solution. A more in-depth analysis may lead to something more definite though
First, ny existing print job(s) can be purged with
CUPS logging verbosity can be increased with
Code:
cupsctl LogLevel=debug2
Restart CUPS, then begin a print job and examine the error log for pertinent messages (/var/log/cups/error_log). If you need help to analyse this, then I'd suggest uploading the contents to
http://pastebin.com/ or similar, and share the link it generates here.