Basically when I try to scan a document on my HP all in one printer,scanner, copier I am being asked to "Select source" in a pop up box but there is nothing in the box to click nor can I type a source ( which I assume is the HP scanner ) into the box. The copier and printer are working fine. This problem has only arisen since I connected the HP all in one printer,scanner, copier to a new pc. Any advice appreciated.