Have been printing sucessfully with HP 7510 for about a year - mostly B&W documents from the main tray, and sometimes 4x6 prints from the photo tray. I was originally printing from Windows 7 ASUS Laptop & for the last two months from a Windows 8 HP ENVY Desktop. One week ago tried to print some 4x6's & they printed on plain paper from the main tray - tried again after selecting "photo tray" in setup, and got "Photo Tray not Installed" error message. I have taken out the tray and put it back several times, loaded the paper glossy side up and then flat side up, and pulled the power plug, and waited 15 min. Apparently, from looking at the Forum for "photo tray" , this is not an uncommon problem. Hope there is a simple solution to this problem.
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