Balck ink not working

This is what worked (so far) with my Dell AIO A940 printer that wouldn't print black ink.

It worked for awhile when I chose photo/glossy paper, but then it quit printing again (see below).

PRINT, PROPERTIES, PAPER SETUP, SPECIALTY PAPER, PHOTO/GLOSSY


I got it to print, again, by putting SEVERAL papers in the feeder (instead of just 1) - there is a sensor that is supposed to automatically detect paper type, and it might not be working right, especially with one or only a couple of sheets.

As if you followed above steps and still facing problem than try this also.
try cleaning the contacts, if there is alot of ink on them then it could cause this issue. use a qtip and isopropyl alchohol. clean the pen catrriage contacts (where the ink cartridge seats in printer) if that doent work then most probably something has failed within the printer.
buy before repairing you must ask the cost as new printer is not soo costly now a days.soo it is worth to buy a new printer install of high repairing cost.
And one more thing you can do is try another printer ink cartridge( Cheap Printer Cartridges ) and check if printer is working fine or not.

Also mention which model printer and Cheap Printer Ink Cartridges you are using

#1.Have you tried changing the ink cartridge? #2.Be sure the sticker (usually yellow) on the top of the cartridge has been removed so that the cartridge has air supply then it can print. #3.Sometimes, during transportation, the cartridge may have been laying on one side, causing the colors to mix, or the print head to dry out. This does happen with both brand new AND remanufactured inks quite often. The first thing to do is try to print 6-10 pages, using all the colors. This may allow for the missing colors to "kick in". If this does not work, then try the following trick (which has an 85% success rate) 1. Take the cartridge out of the printer. 2. Place two paper towels on top of each other and fold them again so that you have a thick square piece. 3. Slightly dampen one side of the paper towel, keeping the opposite side dry. 4. Hold the cartridge with the print head facing down and "dab" it onto the wet portion of the paper towel, using SLIGHT force, for a second or two. 5. Dab the cartridge onto the dry portion of the paper towel. 6. Repeat steps 4-5 about five or six times, ending with step 5. 7. If you have a 3-color cartridge, you should see a line of cyan, magenta, and yellow on the paper towel. 8. Place the cartridge back in the printer and print a test page.