Checked all cartridges..still does not print black...prints colors. Hp 3520 what can I try next?

When the printer sees one empty cartridge, it will stop and tell you. So try replacing the other empty cartridges too as soon as possible.

apply clean prin head from printer utility

try to reset the the black printhead , and clean the it

when you go to print something, the screen comes up with the print instructions
no of copies
print all print pages etc
there you will find a properties tab
click on that and it takes you to paper size next tab is black & white or color click on color and then down the bottom click on default
as to problems with hp printers , I use a hp deskjet 2050 series now over 9 years old and still capable of printing out manuals up to 1000 pages long so makes me wonder if you are expecting too much from your printers and why with so much dissatisfaction with a product, you still persist in buying the brand

Hi there,
To replace the print cartridges
1. 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.
1 Print cartridge slot for the tri-color print cartridge
2 Print cartridge slot for the black and photo print cartridges
5. Pull the print cartridge toward you out of its slot.
6. If you are removing the black print cartridge in order to install the photo print cartridge,store the black print cartridge in the print cartridge protector or an airtight plastic container.

7. Remove the new print cartridge from its packaging and, being careful to touch only
the black plastic, gently remove the plastic tape by using the pink pull tab.
1 Copper-colored contacts
2 Plastic tape with pink pull tab (must be removed before installing)
3 Ink nozzles under tape

CAUTION: Do not touch the copper-colored contacts or ink nozzles. Touching
these parts can result in clogs, ink failure, and bad electrical connections.

8. Slide the new print cartridge forward into the empty slot. Then gently push the upper
part of the print cartridge forward until it clicks into the socket.
If you are installing the tri-color print cartridge, slide it into the left slot.
If you are installing a black or photo print cartridge, slide it into the right slot.
Work with print cartridges 69
Maintain the HP All-in-One

9. Close the print cartridge door.
If you installed a new print cartridge, the HP All-in-One prints a print cartridge
alignment page.
10. When prompted, ensure plain white paper is loaded in the input tray, then press the

button next to OK.
NOTE: If you have colored paper loaded in the input tray when you align the print
cartridges, the alignment will fail. Load unused plain white paper into the input
tray, and then try the alignment again.

11. Place the page print side down on the scanner glass and then press the button next
to OK to scan the page.
When the On

Follow these instructions when you need to replace print cartridges.

• Everyday printing: Use a black cartridge along with a tri-color cartridge.
• Color photos: Use a photo cartridge along with a tri-color cartridge.
To replace the print cartridges
1. 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.
1 Print cartridge slot for the tri-color print cartridge
2 Print cartridge slot for the black and photo print cartridges
5. Pull the print cartridge towards you out of its slot.
6. If you are removing the black print cartridge in order to install the photo print cartridge,
store the black print cartridge in the print cartridge protector or an airtight plastic
container.
7. Remove the new print cartridge from its packaging and, being careful to touch only
the black plastic, gently remove the plastic tape by using the pink pull tab.
1 Copper-colored contacts
2 Plastic tape with pink pull tab (must be removed before installing)
3 Ink nozzles under tape
CAUTION: Do not touch the copper-colored contacts or ink nozzles. Also, do
not re-tape the print cartridges. Doing so can result in clogs, ink failure, and bad
electrical connections.
8. Hold the print cartridge with the HP logo on top, and insert the new print cartridge into
the empty cartridge slot. Make sure you push the print cartridge in firmly until it snaps
into place.
If you are installing the tri-color print cartridge, slide it into the left slot.
If you are installing a black or photo print cartridge, slide it into the right slot.
9. Close the print cartridge door.

Try Try using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English).

If you need more help come back.Post / thumbs / testimonial are welcome!

One or both print head are defective.Open cover put out color cartridge then close cover.If blinking stops replace color cartridge.If blinking continues put out black cartridge and put in color.If blinking stops replace black cartridge, if not stop replace both cartridges.

To replace the print cartridges
1. 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.
1 Print cartridge slot for the tri-color print cartridge
2 Print cartridge slot for the black and photo print cartridges
5. Pull the print cartridge toward you out of its slot.
6. If you are removing the black print cartridge in order to install the photo print cartridge,store the black print cartridge in the print cartridge protector or an airtight plastic container.

7. Remove the new print cartridge from its packaging and, being careful to touch only
the black plastic, gently remove the plastic tape by using the pink pull tab.
1 Copper-colored contacts
2 Plastic tape with pink pull tab (must be removed before installing)
3 Ink nozzles under tape

CAUTION: Do not touch the copper-colored contacts or ink nozzles. Touching
these parts can result in clogs, ink failure, and bad electrical connections.

8. Slide the new print cartridge forward into the empty slot. Then gently push the upper
part of the print cartridge forward until it clicks into the socket.
If you are installing the tri-color print cartridge, slide it into the left slot.
If you are installing a black or photo print cartridge, slide it into the right slot.
Work with print cartridges 69
Maintain the HP All-in-One

9. Close the print cartridge door.
If you installed a new print cartridge, the HP All-in-One prints a print cartridge
alignment page.
10. When prompted, ensure plain white paper is loaded in the input tray, then press the

button next to OK.
NOTE: If you have colored paper loaded in the input tray when you align the print
cartridges, the alignment will fail. Load unused plain white paper into the input
tray, and then try the alignment again.

11. Place the page print side down on the scanner glass and then press the button next
to OK to scan the page.
When the On
Please Don't forget to rate this solution. Thanks.

1. check the ink cartridges
2. make sure the color settings are right in the printer properties panel...it should havea way
3. try, try again

hope this helps