Lexmark CS923
Open door H, and then pull out the booklet maker.
Remove the staple cartridge holder.
Remove the loose staples.
Insert the staple cartridge holder until it clicks into place.
Push the booklet maker back into place, and then close the door.
Remove the loose staples that are stuck in the staple finisher to continue stapling and printing.
Remove the jammed paper in the booklet finisher to continue binding, stapling, and printing.