i have tried this solution but it does not work. The box in printing preferences finishes for double sided printing is definitely unchecked but the printer stil prints double sided. It also does the same when printing from other computers. I didnt have this problem before but recently received a replacement printer ( brand new) from hp becaise of a paper jammming proble in the old printer.
it seems to me like it is some setting on the printer itself rather than each of the individual computers using it. ive searched the menus on the printer but can find nothing that suggests it can be changed to alter this. any ideas please?