Office Pro 8000: Can't Print/Out of Ink Error even after installing new cartridge.

Question

When I tried to use my printer a few days ago, I received a "Can't Print: Out of Ink" error message concerning the magenta cartridge.  I had used the printer a few days before that, and had not received a low ink warning.  It seemed suspicious to me that I would have received an empty cartridge error message without first receiving a low cartridge warning.  The yellow and cyan cartridges read 70% full - all 3 were original cartridges.
I purchased a new 940XL magenta cartridge and installed it per instructions.  Now I am getting a message that the new 940XL cartridge is empty.  I can shake the old 940 cartridge and hear liquid inside.  Obviously, the new cartridge is also full.  I've tried cycling power, reinstalling the software, etc, with no change in status.  If I swap back and forth between the old 940 and new 940XL cartridge, they are properly identified by type on my screen as the 940 or 940XL.  Due to the way the problem has presented itself, I don't believe it is a cartridge issue.
Of course, problem first arouse on May 8th, and my warrantee expired April 26th.  Any suggestions?
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Answer 1

I've solved my own problem, which was clearly a factory assembly defect.  I looked inside my printer with a flashlight in the area where the ink cartridges are installed, and found magenta ink sprayed inside the printer.  I disassembled the printer, and found that the magenta line had been damaged during assembly.  There are four ink tubes which exit from behind the ink cartridges, then make a U turn back toward the front of the printer.  Just after the U turn, they make another bend up-wards.  It is at this point that I found the damaged magenta line, directly above a screw on the right-hand side of the ink cartridge housing.  The lines are in a very narrow passage, and are held in place by several keepers molded out of plastic.  It appears that the lines were put in place in the keepers, then the screw inserted from above.  As I said, it is a very tight passage, and it would be very easy to damage the ink line at that point if the lines weren't carefully held back to insert the screw during assembly.
To solve the problem, I removed approximately 1/4 inch of damaged magenta ink line.  I carefully cut the line with a sharp razor, to prevent collapsing the line or causing burrs to the tubing.  I then placed about 3/4" of self-sealing heat shrink tubing over one end of the ink line.  Next I spliced the line with a small piece of stiff plastic tubing from the handle of a cotton swab, which was a perfect, snug fit over the ink line.  Being careful not to collapse the ink tube or cause further damage, I gently twisted the ink line back and forth until the ends were butted up inside the cotton swab splice.  I then positioned the heat-shrink tubing over the splice, and shrunk it with a hair dryer.  The heat-shrink tubing I used has hot-melt glue applied to the inside, which further aided in making a leak-proof splice.  Again, there is not a lot of room, so the splice had to be kept small.
I reassembled the printer, reinstalled the ink cartridges, and powered up the printer.  After the normal, long start-up delay, I printed several full-color test sheets, and all was fine.  The magenta cartridge that I had installed previously now shows that it is full, and the remaining cartridges also read the levels that they had prior to disassembly.