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in my deskjet HP Deskjet F4480 the cover is open appears while opening the device i found a Arm disassociated unable to find it where it was form please help Update (10/30/2018) Very thankfull sir i here with send the image of that part

step 4… on the left hand side of the top lid assembly is a piece that looks very similar to the part you have. I would take a look in that area and see whether you have the part attached, if there is evidence that some plastic has worn off. Disassembling HP Deskjet F4480 Top Lid

power botton not work, how to change it , and were can buy parts Joe