Two-sided printing option greyed-out HP OfficeJet 7500a
Hi,
Could anyone help me? I just bought a HP OfficeJet 7500a (which does support duplex printing) and I am unable to do two-sided printing as the dropdown menu (located in layout in the print screen) is greyed-out.
Do I require a driver or anything like that?
By the way I am running Mountain Lion Developer Preview if that matters.
Thanks in advance.
Loic
Macbook Pro 13' Late 2010, Other OS, Mac OS X Lion (10.7)