My 11 year old daughter's C-84 sat just that way for a year, unused and
it's exactly in the position as yours. I would certainly get in touch with
Art, as he is a master technician in the undoing of clogs on Epsons and many
other printers as well.
However, at this juncture I'm acquiring my own painful history of C-84
clogging experience, as I have five other C-84s at school in your condition,
even though they've been used over the two years we've had them. One other
C-84 is running fine, but the teacher uses hers everyday.
The Epson Dura-brite inks that are used in them are formulated to dry very
fast. Apparently too fast and thus clog the jets and tubing even when they
shouldn't, if not used more reguilarly than most printers. What's more is
that undoing a clog in them is akin to a small miracle. I have run cleaning
cycles, new ink cartridges, intravenous cleaning solution, bottom head
cleans, and nothing has worked. Art may have a possible wonder method to
allow unclogging though. I'd be anxious to hear if you have success.