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From the manual: Make sure the HP All-in-One is on. Caution If the HP All-in-One is off when you open the print cartridge door to access the print cartridges, the HP All-in-One will not release the cartridges for changing. You might damage the HP All-in-One if the print cartridges are not docked safely when you try to remove them. 2. Make sure you have letter or A4 unused plain white paper loaded in the input tray. 3. Open the print cartridge door. The print carriage moves to the far right side of the HP All-in-One. 4. Wait until the print carriage is idle and silent, and then lightly press down on a print cartridge to release it. If you are replacing the tri-color print cartridge, remove the print cartridge from the slot on the left. If you are replacing the black or photo print cartridge, remove the print cartridge from the slot on the right. Chapter 1 14 HP Photosmart C3100 All-in-One series HP All-in-One overview 1 Print cartridge slot for the tri-color print cartridge 2 Print cartridge slot for the black and photo print cartridge
It is possible. You will have to go into the properties of the printer you're using. Assuming you're using WinXP, go to Start>Printers and Faxes and right click your color printer. Choose Printing Preferences. Using my HP Photosmart C3100 as an example, I would next choose the Color tab and under Color Options, choose the radio button that says Print In Grayscale. That will do it.
I'm glad to see that I'm not the only one who has had this problem without a solution. I found that by moving the print cartridge (with the power on) all the way to the left, closing the door, powering it off, then powering it back on, then doing the test print (cancel and color start copy key), it would print. Had to do this 2-3 times. Then tried printing a document and it printed. So far, it 'appears' to be working OK. Hope it keeps working, otherwise I will just have to get another printer...
I just got off the HP help line. After changing my black ink cartridge a test page was printing each time I turned the machine on. This is very costly, in both time and ink as the cartridges themselves for this machine hold very little ink. I tried to learn from HP tech how to turn off the test-print while keeping my color cartridge empty. It turns out that you cant do it. HP requires you to keep buying and using cartridges whether you need them or not.If you buy the color ink it will use it up in its testings. And if you dont buy the color cartridge it will use up your black ink by printing the test each time you turn on the printer. The printer was inexpensive sure, but I'm paying for it in wasted ink.