My Photosmart 6510 printed just fine for 18 months. Yesterday it worked, and today it gives the message PAPER MISMATCH. I have always just used standard paper, with good results. I,ve done everything, including uninstalling and re-installing the CD software. I know the Mac 10.6.8 talks to the HP 6510. All cartridges are new and full. I will appreciate all help.
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