Here is also a comprehensive guide on what to do when this happens again in the future:
http://gdgtpreview.com/2018/03/your-epson-printer-doesnt-recognize-the-ink-cartridge-heres-what-to-do
Here's what you can do:-disconnect the printer from the computer-turn off the printer-inspect for anything foreign inside like jammed paper-turn the power back on-remove the ink cartridge-check the chip connnector at ink tank and at head carriage. If its dirty clean it with soft moist cloth. -check the status monitor. which ink tank not recognized. -press ink light (1-4 times) depends on number ink tank not recognized, press 1 time again, carriage will move co replacement position, unplug and plug again all ink tank, press ink light 1 more.
if that doesn't work, replace ink cartridge ONLY if you have a spare. DO NOT BUY new ink as the printer is bound for repair.
the page formatting is awful, re-posting:
-disconnect the printer from the computer
-turn off the printer
-inspect for anything foreign inside like jammed paper
-turn the power back on
-remove the ink cartridge
-check the chip connnector at ink tank and at head carriage. If its dirty clean it with soft moist cloth
-check the status monitor. which ink tank not recognized
-press ink light (1-4 times) depends on number ink tank not recognized, press 1 time again, carriage will move co replacement position, unplug and plug again all ink tank, press ink light 1 more
if that doesn't work, replace ink cartridge ONLY if you have a spare. DO NOT BUY new ink as the printer is bound for repair.
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ink light is off. 
ink button for 3 seconds until the 
On light starts flashing. The Stylus CX runs a head cleaning cycle and the On light flashes. 
Caution:
Never turn off the Stylus CX while head cleaning is in progress. You may damage it. On light stops flashing, turn off the Stylus CX. ink and 
On buttons together and hold them down for about 3 seconds. The Stylus CX turns on and prints a test pattern, which includes a nozzle check. Shown below are some examples of what the nozzle check may look like: 
Nozzle check pattern with gaps
Note:
If you don't see any improvement after cleaning the print head three times, turn off the Stylus CX and wait overnight. This lets any dried ink soften. Then try cleaning the print head again.
Note:
If you can't remove the paper or foreign object yourself, do not use force and do not disassemble the Stylus CX.246 views
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