Since I deleted the print queue to solve the common problem of 'a deleted job refusing to vanish from print queue'. From that time on, I have been unable to print any requested jobs. I have reinstalled the sofware, to no avail. I used "cancel"button + "colour copy" button as suggested in HP notes, and the printer did print a test colour sheet. On the sheet, there was a list of numbers ... 11 to 16 then 21 to 25 then 31 to 33 ... then 41 to 45 (this last batch had the word Error against each one, followed by various numberals/letters).
Please help.