Here is another weird cause for this, I had an M602 with "Lifting Tray2" on display, would not code, no motor. If you put paper in Tray 1, and ran a Config page, it would say Printing from Tray 1, but never move. MY SOLUTION - Had the wrong toner in it!! An Aftermarket Q5421 for the 4350 was put in, it knew
it had a cartridge, but would not read the chip! It could not because the chip is a diffrent size in a different place. Also I had been told a defective cartrdge could do the same. My NY tech has the same situation today, but says New Cartridge, new DC Controller, has not solveed it yet.
Supplies for HP 43-45-M6.pdf
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