THE BLACK INK STOPPED WORKING ,SO I GOT A NEW ONE AT STAPLES. I PUT IN THE NEW ONE,BUT IT STILL DIDN'T WORK.WE TRIED PRINTING IN COLOR AND THAT WORKED,BUT IT DIDN'T PRINT BLACK.WHAT SHOULD I DO NOW?ALSO WHAT PAPER/INK SHOULD I GET TO PRINT PHOTO'S?

Recently, I had a similar problem which turned out to be faulty non-original ink tanks (cartridges) - they had a valve which was supposed to allow air to be drawn in as ink was drawn out. It turned out they had "gummed up" and weren't allowing air in, so once a small amount of ink had been drawn out a partial vacuum was created and stopped the flow of ink.
If fitting new, original ink tanks and running the cleaning routines a few times doesn't fix the problem, then this could be several things, some of which may mean your machine will have to be repaired by a Brother agent (probably cost you more than a new one), and/or it's time to bin it.
However, sometimes it's just because the print head, or the pipes that connect the ink tanks to the printhead, have become blocked with dried out ink.
If you search on YouTube, you will find a few videos that show how to clear such blockages - you may not find your exact model number, but many Brother machines use almost identical components to many others so the basic technique will be the same. Also search on Ebay for printer cleaning/head blockage kits - quite a few printers (not just Brother) suffer similar problems and a few businesses have sprung up on EBay that sell kits to help you sort this. They sometimes have links to a video they have produced showing how to use the kit which can give you ideas. Again, your exact model number or even make might not come up but these kits might be adaptable to your machine. Got to be worth a tenner or so before binning it ! Good luck