I solved the problem, thanks to everyone here. Here's what I did:
- I phoned HP support, but they said the printer's too old and no
longer supported. (Or maybe their voice recognition system
misunderstood me when I mumbled the model number.)
- I was going to take the printer to my house, when I decided to try
one more thing.
- I installed the driver from HP's website. Yes, I left the printer
power on while I installed. (Ato_Zee, I didn't get a CD with the
driver, I had just used WinXP's driver.) This also installed the HP
"Toolbox" software. Ian, you mentioned this toolbox, but I didn't
know what you meant.
- The toolbox has a screen to check the ink levels, so I tried. But
it told me that it could not connect to the printer. I was also
unable to print a test page (by clicking the button in the driver
properties), even though I had been able to earlier.
- Now that I had a definitive message, I decided to double check the
cable connection. The cable was firmly plugged in, but the parallel
port seemed to be a bit diagonal, and I was only able to screw in one
of the two screws that secured the parallel cable to the PC port. It
did seem firm enough, but now I had extra incentive to check this. I
thought the internal screw that held the card onto the PC chassis was
missing. So I opened up the box, but the screw was there. Everything
really did seem tight enough, but the card was slightly angled.
- I don't know if I can describe this, and it doesn't really matter.
Feel free to skip this paragraph. The green card is attached to an L-
shaped metal piece that holds the port / socket that you see from the
back of the computer. That metal piece's top screws onto the
chassis. The metal piece's bottom just fits into a space beside the
motherboard. That bottom piece was horizontally offset from where it
should be. That's it. So, I shoved it back a bit.
- Then I plugged in the parallel cable, screwed in both securing
screws, and it worked!
- Credit goes to all those who gave suggestions. The suggestion to
reinstall the driver led me to double check the cable connection.
It's funny how, in my first post, I said, "don't ask me to check that
the cable is plugged in".
FYI:
There is a way to access the DJ 930's internal diagnostics test page, but I no longer have the panel button sequence list to access that.
The command sequences are listed on this page:
http://h10025.www1.hp.com/ewfrf/wc/...cc=us&product=58118&lang=en&docname=c00213505
To print the internal test page: With the printer on, press and hold
the RESUME button until the printer starts printing. It printed a
multi-coloured flower. BTW, there are also sequences to run a self-
test and a diagnostic test.
Thanks.