Computer SAYS there is a paper jam on my HP PSC 1401 All-in-one Printer Scanner Copier how can i change my software to force my printer to print (I already checked and there is no paper jam I can see) and my printer can print out the test page WITHOUT a struggle.If you dont know how to change my software to force my printer to print, could you moved me to the hardware forum and/or tell me where could I have missed the paper jamming my printer.How did you check for a paper jam?  Does your printer have a rear panel that can be opened?  Did you look there? 

If you are quite SURE it has not paper jammed in it, try powering off both the printer and computer and restarting both.  Does the software still report a jam? Paper jam does not only mean there will be a big paper sheet visible. Even if there are small piece(s) of paper stuck in the rollers, the printer may still report a paper jam.

If soyabean's solution does not work, then you may try the instructions/solutions by HP on this linkThe paper jam is being reported by the printer and there is no way to force a print job if the printer thinks it is jammed. IF you believe that the printer isn't jammed you could trying disconnecting it and unplugging it for a few minutes to let it clear its INTERNAL memory. Also try uninstalling it from the PC and re-installing it. But I'm with the others, I would look for a small piece SOMEWHERE.