P50 dose not print black color

SOURCE: epson c66 will not print black

Do print head cleaning. Contorl panel>right click on c66 and go to printing preferences>maintenance tab>print head cleaning>do it 3 times and then try to print

SOURCE: Epson C66 won't print without color cartidges

epson printers won't really print if one cartridge is not detected or detected as empty. the only option that i can suggest to you is that, buy a continous ink kit at any ink refilling station in your place. i highly recommend that dont leave a cartridge empty with ink cause it might clog your printhead. using a continous ink system's cartridge is auto reset, whenever the printer says that the cartridge is empty, it will automatically resets itself. ink refill kit comes with 100+ml of ink per color i think. and it is much cheaper using original epson ink.

SOURCE: Black ink not printing...

same on a test page?

SOURCE: Epson Stylus Photo R800 Print Head Nozzles ??

Don't use nozzles clean function, besides ink consuming it can cause damages that cannot be fixed: black lines on the back side of the page that will be permanent. Instead put two photo paper together (2x260 gr) and push the two papers together into the printer while printing a motive including many colors. Do so a couple of times and the clogg usually disappears. Good luck! jonk

SOURCE: epson stylus C88 won t print color ink black is

If you have carried out 4 to 5 head cleans, waited about 8 hours and done another 3 or head cleans doing nozzle checks after each clean (as recommended by the manual) and there is still no improvement then you will need a third party head cleaning solution such as this one:
http://websites.uk-plc.net/UK_Inkjet_Cartridges_PLUS/products/Print_Head_Cleaner.htm
Other makes & brands are available just google "inkjet head cleaning solution" Hope this helps.