I figured out for it to accept the Color cartridge I have to Reset the printer (instruction for HP deskjet reset is available on internet), however, it never accepted black cartridge, it always show Black cartridge Indicator LED blinking meaning it is not recognizing the refilled cartridge. In my old printer, I could refill old cartridge & keep using printer, but this new HP DESKJET 2135 never accepts refilled cartridge. Print again an alignment page and the ink level should show full.I hope helps other I hv been fighting with my printer for 6 mon now

Put the cartridge back again into the printer.

Take the cartridge out of the printer one more time, and remove all adhesive tape.

Place the cartridge into the printer again.Now grab adhesive tape and put it over the 2nd column from the right, on the top contact. Do not touch or remove the tape that was originally put on the cartridge.Take the same cartridge out of the printer when the alignment page is done.A message may show up that there is an issue with your cartridge. Place the cartridge back into the printer.Remove the cartridge and on the 2nd contact column from the left, place adhesive tape over the top contact in that column.

Plug in printer and reinstall cartridges one at a time.Hold the power button on for 30+ seconds.Remove the cartridges and unplug the printer.Method 2: A full reset of the printer should also do: Print a test page to ensure the cartridge level system is reset.

Insert back the cartridges inside the printer.This will make the printer 'remember’ the last 5 cartridges as 'none’. HP printers normally store the identification information of the last five ink cartridges that were used. Repeat this step five times so that the HP cartridge identification information will be erased from the printer’s memory. Allow the printer to completely turn off. Press the ‘On’ button on your printer to turn it on, wait 20 seconds, then turn it off.Remove both the black and the color ink HP cartridges from your printer.There are three ways to reset the ink level on HP deskjet.

Test print hp deskjet 2135