The point is was the printer running ok before your changed the toners? If so then probably the yellow toner is faulty. Are they genuine HP products or compatibles? What happens if you change the toners back to the original ones one at a time. This will then tell you which one is causing the problem.
Testimonial: "It was doing the same thing before I changed toners."
Tech suppoprt lied to you. It sounds as though you have a logic board problem.
Testimonial: "I will check on the logic board. Are they hard to install?"
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