It sounds like when installing it may have poured out a little of the black powder that it uses. You must be careful when installing as the can be mess if not carefully installed. I would get a microfiber cloth and wipe it out as best as possible.
This printer has the "powder" for ink. Somehow when changing the toner / waste toner, one must have exploded. Any tips as to how to get rid of it ? Each time we open the printer, it seems to get worse.