4650 will not allow duplex printing

[Othapus]

Have tried every tip I could find but my 4650 refuses to do automatic duplex printing, strictly manual. Have tried setting preferences but it keeps going back to "Duplex not installed". No help from Chat support and can find no way to ask HP about the problem.

If this helps:

When trying to set to auto duplex, in preferences, the "Everyday printing", "economical printing", the "Duplex printing", and the other one, all have locks over them and are "greyed out". Have added the "Print & Scan doctor", The "Smart app" and done everything but try a big hammer. Any other suggestions before I throw out the HP and find something else?

[ShlomiL]

Hi,

Try following below specific version of the HP Print and Scan Doctor Utility by selecting your printer:

http://ftp.hp.com/pub/printers/hppsdr/patches/HPPSdr.exe

Be sure to restart your PC and allow the utility to complete the process, then check for any difference.

Try printing and check for any change, if the same remains try printing using the newly added print queue copy (Copy1) and check for any difference.

Shlomi