The four new ink cartridges are stuck in my EPSON workforce WG-2540. They are inserted so that I can see the four step drawing of how to insert the cartridges. I can turn the printer off and they clic

SOURCE: Just installed Epson NX400 printer.

I found a solution to the same prolem that you guys have. I took the cartridges out and shook them horizontally, instead of vertically, with the large surface up for 3-4 seconds. Re-inserted them back in. Then I started seeing on the LCD "Recharging Cartridge". When it returned to regular copy screen, I turned the printer off and turned it back on. No more error message. It's been working for almost a day now. Try it to see if that works for you. Good Luck.

FYI. I just bought NX400 last Friday. The error message came on this morning.

SOURCE: epson stylus cx8400 cannot recognize ink cartridges

I had the same problem except it would not recognize any of the ink cartridges. I kept hitting the OK button over and over again with the same cartridges in place not removing them at all and it finally recognized them. Decided to go to maintenance on the printer to do a test, and it went right back to not recognizing the cartridges. So i pressed the OK button over and over again until it finally recognized all the cartridges again, but this time i did not try and go into the maintenance to do a test run. Plugged it up to the computer and it has been working ever since. So press the OK button until it recognizes the cartridges, and run no tests on it is what my solution was for the problem. Really is a pain but it works now.

SOURCE: Epson printer says "cannot recognize ink cartridges".

Are you using genuine epson cartridges? Many generics simply dont work on the newer printers. Once the printer decides the cartridge is empty, it sends a signal to the chip and that's it. You might hear ink, but if the chip says empty you can't use it. It also has the annoying habit of doing this when there's still 10-15% of the ink left.
I use reusable cartridges from http://www.ccs-digital.com They hold 2/3 more ink and the chips automatically reset to full if you remove and re-insert the cartridge. Instead of replacing the entire cartridge when it's empty, you pop out an internal ink tank and replace just that. So you know the chip has already been recognized by your printer. The ink tanks cost under $3. I think these are a brilliant invention.

SOURCE: EPSON Stylus NX110 - 1st Ink Cartridge Replacement

you better have your printer check by a qualified printer tech thus avoiding any further damage to the printer the printer head is the most likely problem to

SOURCE: Epson Stylus SX400 "Ink cartridges cannot be recognized"

Try this: First check which cartridge(s) are not being recognized. In my case where I replaced all three color cartridges, two were recognized right away but one was not. You find out by sending a print request to the printer and looking at the ink cartridge levels diagram in the dialog window. In my case two of three were fine but one had a red X on it. So I removed it and cleaned the contacts with alcohol then rocked it in the slot after pressing it in. It was recognized and the charging process began as normal.