Black won't print, colo prints fine. - HP Officejet 6310 All-In-One InkJet Printer

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

Not normally but the black print head nozzles maybe blocked.
Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer than replace the print head.

You need to replace the Black cartridge, as it appears the colour one is fine. Look in the printer options on your PC for a display of ink levels, and you'll probably find the black down to zero. If you've used generic cartridges, not genuine HP, you may find the printer can't actually read the ink levels.

epson 7600 black ink failure

see your cartridge if it is full or empty. what os do u use?

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.

You need to call Brother at 1-877-brother and tell them your mfc is "missing black". They will tell you where to take it to get the print head replaced under Brothers' warranty. This is a VERY common problem and Brother will cover the cost to repair it.

Be sure to remove the protective cover on the nozzle. Also clean the contacts on the PRINT CARRIAGE. Try to replace the ink, to isolate the problem.

It is like he says. My 9420cn uses all the colos even if the machine just prints out received faxes. Its really annoing and costs too much.

So does anyone know a solution how to stop it from using all colors to print black?

If it's a Canon machine, you will need a purge unit. If it doesn't clean and prime properly, it
will just give you blank paper.