Digital BW, The Print

I am temporarily using a Photosmart 7760 while I wait for a new R220.
 Yesterday I was able to print perfectly neutral BW images, but
something has gone terribly wrong.  Today every time I try to print BW
I get this incredibly warm toned result.  I switched to the U.S.
Prepress Defaults setting in Photoshop that Clayton Jones recommends,
and have the Print Space Profile set to "Same as Source" in the print
preview window.  Nothing seems to make any difference.  The 7760 has
both the TriColor and PhotoGray carts installed.  I thought perhaps
that something had gone wrong with the TriColor cart, but I just made
a perfect color print using the same carts.  I'm at a loss to
understand how I was able to print neutral BW yesterday, and can't
come close today.  What went wrong?

Rem