Buy HP - Hewlett Packard C8947A-PC_BRD_DC
Internal power supply board - power cable plugs on this assembly, remove covers to install pc board. For DeskJet 3420
HP - Hewlett Packard
OEM (Original Equipment Manufacturer) - this item is the original item from the manufacturer sold as brand new.
Refurbished is the process of reselling an item that had been in good working order. Refurbished items are dis-assembled and restored to "like new" condition.
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