Our new LaserJet Pro 400 M451dn is printing shadows on the printouts. It's the same text, lighter and lower. I've run the "clean page" option - it works for a few times, but then goes back to the shadows. It also began to print much slower than when we first got it.
It's a networked printer, accessed by 5 Windows 7 machines. It does a good amount of printing, and our previous model was quite the workhorse (over 200,000 images).
I couldn't find anything in the manual, or on the machine itself.
Thank you in advance for any advice.