- 1). Shut down and unplug the HP 4050.
- 2). Reconnect the printer to its power adapter.
- 3). Locate the "Item" and "Value" buttons on the HP LaserJet 4050's control panel. Press and hold down the left side of these buttons, then turn on the printer.
- 4). Continue holding until you see a "Reset Maint Count" message in the printer's control panel. Wait for the control panel to show "Ready."
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