Here you go guys: "I have had this printer for about 6 months.
Both times I have replaced with Genuine HP ink cartridges this has happend.
Both times the fix has been this: on the top of the cartridge, where you pull off the plastic, is an air channel that runs across the top of the cartridge. The first time the plastic did not pull off cleanly and there were bits plugging the channel.
The second time, the plastic pulled off the straight channel, but where it runs into a bunch of S-shaped curves it looked blocked.
I poked a tiny hole with a pin in the first S-curve through the plastic and the cartridge worked.
The channel must be open or the ink cannot drain into the printer- it creates a vacuum.
This is a manufacturing defect and HP should look into fixing it.
For others finding this forum, get a small, sharp pin and open that channel and try it again.. just be careful not to collapse the plastic in the air channel and plug it up worse.."