Jasper,

Now you really have me confused as to what your intent is.

First, retVal is not the solution value of the model, it is the solver
status value.  I.e., what kind of solution was delivered.  E.g.,
feasible, infeasible, unbounded, etc. Frontline now hides their
documentation link and makes it available only to licensed users.  But
that contains the return codes for solver.  You may be able to do a
web search and track them down someplace else.

So back to your model itself.  It still doesn't make sense.  The the
model solution value is your SetCell.  So you have that defined.  The
ByChange value is supposed to be the range of decision variables.  If
you are only defining a single cell as a single decision variable,
there's not much of a problem.  Especially because you are not
defining any constraint sets.

Which leads me to ask about your 16,000 repetitions.  Are you actually
looking to do a simulation with 16,000 repetitions?  Because if you
are, you are using the wrong platform.  Solver is an optimization
engine not a simulation engine.

If you do indeed have a simulation problem, and the model is pretty
simple, you could code up a 16,000 iteration model in VBA using
Excel's built-in Random function.  Or to make your life easier, you
could download a trial version of a simulation software package
like@Risk or Crystal Ball and just try to get all your model runs in
before the trial period runs out.  Although I would guess that your
university has copies of spreadsheet simulation software available for
student use.

SteveM