Even if it is only for diagnosis, it's the first step if you are using
If you put in a new HP original and get the same error message then it
points you in another direction.
When you buy a new cartridge, look for the largest contents you can
find. Beware of multipacks unless you are sure you will install the
second one before the Install by date which is the warranty on it. And
of course don't use the multiple grays unless you are printing B&W
photographs for which they help give superb results.
Someothing else to watch out for but which may or may not be true for
the PS7960 is the Photo Value Packs. For my PS8250 the cartridges have
less ink in them than the normal retail packages on the grounds that
they supply enough ink to print the 100 sheets of photo paper that
comes with them.
I bought one for the 8250 since the pack with 150 sheets of 4 x 6 in
paper was much less than price as just the normal retail collection of
6 cartridges! Then on the package (and implied on the website now) is
that they are not normally filled!
I just checked the HP website at: http://www.shopping.hp.com/supmodel/...A?jumpid=in_r3
and their prices are remarkably reasonable since they offer free next
day shipping! I checked out ATLEX in Florida who are well thought of
for genuine inks and toner and they wanted as much to ship one
cartridge (which was $2 less than HP) as the cartridge cost!
Do let us know about how you get on.