Let me know the test results and you have a good day ahead.
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Sorry, but you didn't read my question properly. What I said was that it 'refuses to obey command to print from photo tray'. In other words, I know how to tell it to print from the photo tray - it just doesn't obey the command. Looking online for solutions to this problem, I can see that many many people have encountered the same problem. Does HP have a solution? If not, this printer is going back to the shop!