Multifunction printer print blank page on copying

[comp_see]

I have a HP Officejet G4500-g10gn multifunction printer. It works OK on printing b/w, color from computer; scan to pdf. However, when I want to do b/w copying, it prints out a blank page; color copying, it only prints only color part but not the black text. I checked that ink black cartridge level is OK and the scanning lamp lights on and moving.

Please advise me how to diagnosis and fix this problem. Thanks.

[Train]

Uninstall it, reboot and re-install.
Normally that takes care of problems.

[comp_see]

The problem happens on copying NOT printing. Therefore, whether a networked computer is turned on is not required.

[comp_see]

One more point is that scanning to pdf or photo are both OK.

[Train]

Now with that, sorry, but I have no idea how to fix.

[dneilson]

Do you have the latest correct Driver for your OS? Might try HP Support or Forums.

[comp_see]

Thanks for everyone's advice. Since the machine can do copying without connecting to a computer (I turn off the w/l and do copying, it still prints out a blank page), I think there is nothing to do with the driver. I tried to search any firmware update and found nothing.

I guess that it may be the printer is malfunctioning.

[jstanek7]

Google realigning the drum