Magenta ink cartridge does not function properly

If the machine is just using magenta, yellow and cyan to make black then you get brown, not black, (that why you have a black image unit, because YMC will not make black, color system issue. unless the machine is using yellow,magenta, cyan, then black. Are you using 3rd party toner or OEM cartridges? Did you replace the cartridge before it was required?

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This model printer has only two slots for ink cartridges. One is for a black ink cartrigde and the other is for a tri-color cartridge which contains cyan, magenta and yellow inks.
This tri-color cartridge has run out of yellow ink, you need to replace this tri-color cartridge.

It means for you to install the magenta ink. Magenta is a color. You have 4 colors. Yellow, magenta, cyan, black

To replace the ink cartridges
1. Make sure the HP All-in-One is turned on.
2. Open the ink cartridge door by lifting from the front center of the device, until the door locks into place.
3. Squeeze the tab below an ink cartridge to release the latch inside the HP All-in-One, and then lift the latch.
If you are replacing the black ink cartridge, lift the latch on the far left.
If you are replacing one of the five color ink cartridges, such as yellow, light cyan (blue), cyan, light magenta (pink), or magenta, lift the appropriate latch in the center area.
4. Pull the ink cartridge toward you out of its slot to remove it.
5. Remove the new ink cartridge from its packaging, and then, holding it by the handle, slide the ink cartridge into the empty slot.
Make sure that you insert the ink cartridge into the slot that has the same shaped icon and color as the one you are installing.
6. Press down on the gray latch until it clicks into place.
7. Repeat steps 2 through 5 for each ink cartridge you are replacing.
8. Close the ink cartridge door.

re Printing in black only - you can do this by selection this option from your application and choosing the print properties of the printer and setting to Black / Greyscale printing only.

This happened to me twice, You can possibly have no ink in your cyan,magenta and yellow , you would then have to replace them to work the set. I had to do that and it worked =]

The following text copied from HP website to tackle this problem. Follow the instructions below to install the print cartridges. NOTE: If you are installing ink cartridges in the unit for the first time, be sure to use only the print cartridges that came with the unit. The ink in these cartridges is specially formulated to mix with the ink in the print head assembly at first-time setup. Installing the print cartridges

1. Verify that the unit is on.
2. Open the ink cartridge door. Figure 1: Opening the ink cartridge door
3. Squeeze the gray tab below an ink cartridge slot to release the gray latch and then lift the latch. Figure 2: Lifting the latch 1 - Ink cartridge latch for the black ink cartridge 2 - Ink cartridge latches for the color ink cartridges NOTE: The ink cartridge areas are color-coded for easy reference. From left to right, the ink cartridges are black, yellow, light cyan, cyan, light magenta, and magenta.
4. Remove the new ink cartridge from its packaging.
5. Hold the ink cartridge by the handle and then slide the ink cartridge into the empty slot. NOTE: Make sure that the ink cartridge is inserted into the slot that has the same shaped icon and color as the ink cartridge. The copper-colored contacts should be facing the printer as the ink cartridge is inserted. Figure 3: Inserting an ink cartridge
6. Press down on the gray latch until it clicks into place. Figure 4: Closing the gray latch
7. Repeat steps 3 through 6 for each ink cartridge that needs to be replaced. NOTE: All six cartridges must be installed. The printer will not work if an ink cartridge is missing.
8. Close the ink cartridge door. Figure 5: Closing the ink cartridge door

Have a Good Day

1. Clean The Print Head Nozzles (Mac OS X) MP500 / MP800 2. Clean The Print Head Nozzles (Windows) MP500 / MP800 3. Confirm that the recommended ink tanks are installed properly MP500 / MP800 4. Install recommended ink tanks in the correct order MP500 / MP530 / MP800 / MP800R / MP830 5. Perform A Manual Print Head Alignment (Mac OS X) MP500 / MP800 / MP950 6. Perform A Manual Print Head Alignment (Windows) MP500 / MP800 / MP950 7. Perform the print head cleaning procedure on MP500 / MP800 8. Print Head Alignment MP500 / MP800 / MP950 9. Remove tape from the MP500 / MP800 ink tank 10. Replace ink tank(s) MP500 / MP800

I hope it helps!!!

Replace the ink cartridges (from the manual for the printer)

Follow these instructions when you need to replace ink cartridges.

To replace the ink cartridges

1. Make sure the HP All-in-One is turned on.
2. Open the ink cartridge door by lifting from the front center of the device, until the door locks into place.
3. Squeeze the tab below an ink cartridge to release the latch inside the HP All-in-One, and then lift the latch. If you are replacing the black ink cartridge, lift the latch on the far left.
If you are replacing one of the five color ink cartridges, such as yellow, light cyan (blue), cyan, light magenta (pink), or magenta, lift the appropriate latch in the center area.
4. Pull the ink cartridge toward you out of its slot to remove it.
5. Remove the new ink cartridge from its packaging, and then, holding it by the handle, slide the ink cartridge into the empty slot. Make sure that you insert the ink cartridge into the slot that has the same shaped icon and color as the one you are installing.
6. Press down on the gray latch until it clicks into place.
7. Repeat steps 2 through 5 for each ink cartridge you are replacing.
8. Close the ink cartridge door.

No. Just buy original carts and install them. Run the manual cleaning procedure twice. Wait overnight and repeat the manual cleaning again. Should work. (..and give the compatible ones a dump)