First off, could I ask people to please not post in HTML?

    I've got a D70, which I have been using for over a year now, and
have had no problems with it so far.  Over 4000 shots the first year,
and about 2000 so far this year.

    That may have been oxidation on the battery terminals, wiped off
by the removal and replace cycle.

    There is a reset button on the bottom.  It is a tiny recessed
button on the left-hand edge of the bottom plate, about a quarter of an
inch from the front corner screw.  It is small enough so you'll probably
need something like an unfolded paper clip to depress it.  And I forget
whether the manual suggests that you hold it depressed as you switch the
camera on, or whether just depressing it does the job.

    There is also a menu reset -- the topmost item in the menu
selected by the image of a pencil at the left margin.  It is labeled
"[R]" at the left, while all the others have two-digit numbers.  It is
just above menu entry "01".

    I've never had to use the button reset, and I've only used the
menu reset once.

    But I've never encountered a "single click" problem with mine.
It just keeps taking photos.  Is it possible that an insect got into the
mirror compartment when a lens was being changed, and resulted in the
mirror motion being jammed?

    Good Luck,
        DoN.

Ahhhh... How about turning on the line wrap at something around 75 to
80 characters?  Your post came through as one long line.

As to the D70s, I'd try a "reset" if the problem doesn't clear up.
Otherwise I'd head back to the camera store.
My D-70 had the flash fail within a week or two of purchasing it and
then a few months later the focus couldn't make it all the way to
infinity and that was with what ever lens I put on it.

Both times the camera came back within a couple weeks.

Thanks<:-))

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com