Which Linux distribution/version are you using ? (eg. Ubuntu 12.04, Peppermint 3, etc.)
If you open a terminal (Ctrl+Alt+T) and run:
Doees the "Printer" dialog box open ? .. if so, right-click your printer, and select "View Print Queue" .. are the print jobs listed ? and can you delete them by highlighting them and clicking the red X at the top ?