Have just put in a two new cartridges and it won't print black?

Do a Clean Printhead operation.
This will usually correct the problem.

I just had this exact problem on my HP 5514. Black won't print after running out of black ink. New cartridge no good.
I tried everything-no good. I suspected the pinholes in the printhead were clogged with dried ink because I didn't change cartridge in time.
The fix that worked perfectly was when I hacksaw top off old black cartridge & removed all foam wicks so now I had a funnel(can see clear thru). I installed the cartridge & filled it with alcohol, printed page & did head clean; then printed few more pages. Problem cleared almost immediately. I then soaked up extra alcohol inside cartridge with paper towel. Removed modified cartridge & installed good one. I guess this could be done for colors as well. I don't know if this is a proper procedure, but it sure worked well for me.

Its simply because the cartridge is not making a good contact with its socket.
1-switch off the printer and totally unplug it 2-clean the cartridge properly
3- check the cartridge clip
4-return cartridge and send a feedback to us

i think all printers do not print if one of the separate color cartridges is empty. check ink and replace. hope this will help.

I have the same problem. Everything on the printer is working just fine. It'll do a test page just fine, so everything's working right. The %$^ thing just won't print. It makes noise like it's printing when you give it a print job, but it spits out blank pages.

Your machine needs to be serviced.
replace the cartridge with the original one.
it can not print if one cartridge is missing or not original.

Yes you can. and please check the cartridge. there would be a plastic cover on the cartridge heads. please remove that

Use the software that was installed when you installed your printer to clean your print heads.

Black only would be good for mine too it only prints colours!! and I put in new Black cartridge?? Anyone?

Run the PQ troubleshooting diagnostic.
See if the black is printing.
If not, run the Disable Cartridge check. This will allow you print with only one cartridge in the printer. Take out all the cartridges. Put the black in another slot and put the cyan in the black slot(the top). Print the config page. If the black is printing, is the cyan printing. If black isn't printing the cartridge is bad. If black is printing and cyan isn't something is wrong with the printer. If they are both printing put them back in the correct locations along with the other two colors. It isn't the printer.