I can't print photos on photo paper with my HP Officejet Pro 6978 printer. I found numerous replies to the same question on the internet and followed the suggested instructions, but I'm still having no luck . I can print on letter-size paper, no problem. I don't understand what I'm doing wrong, or maybe it's something I'm not doing, I don't know. Does anyone have any idea what the problem could be? I sure would appreciate some help. Thank you.
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