Epson Stylus D120 not printing

SOURCE: epson stylus 1290 - machine locked up

You can download the repairer's manual for free from http://pcprinter.blogspot.com/2008/05/service-manual-for-epson-89012801290.html  which is where the solution below is listed (p.68).
Basically Epson want you (or, rather, a service centre which you'll have to pay!) to replace the waste ink pad every so many copies. However, you can reset the printer even without replacing anything by switching it off on the silver button, switching it on again whilst holding down the two black buttons alongside it, then releasing them all before quickly holding down just the left-hand black button for 10 seconds. You have only three seconds to do this after switching back on, whilst the green and red lights are flashing together. If you're not quick enough on the first try, switch off using the silver button and repeat the procedure!

SOURCE: My Epson Stylus DX5000 won't work.

i had the same problem and checked for paper jam but wasnt any so i kept turning on the printer while looking in side and found that one of the little white cogs where the ink box rests wasnt catching when i pushed it into place the printer set itself and started working maybe you could try this. good luck.

SOURCE: changed black ink cartridge for epson stylus d120 but not working

Usually when this happens the printer fails to goes through the motions of the printing process, kind of stands still with indicator lights just blinking away. This could be as a result of either of these scenarios.
i.                     Ink cartridge has developed incompatibility or is incompatible
The Solution is to try an older/another cartridge (doesn’t matter if ink is finished. You must replace cartridge one at a time). If lights stop blinking it confirms that your cartridge has become incompatible or developed incompatibility. Also if your printer is the type that can work with only one cartridge, remove one after the other (closing back the lid/cover) to determine which in the set (black or color) has become incompatible. At the instance the incompatible one is removed and you close the lid, the blinking will stop (for printers that can print with one ink cartridge only). Just replace the incompatible one and start printing again. In most cases the issue is always with one cartridge. But if both are affected, you have to replace both. Because of this type of problem, always keep used cartridges somewhere safe; they come in handy for this type of troubleshooting.
ii.                   The Cartridge electronic panel  is dirty
The electronic panel on the cartridge that makes contact with the cartridge carrier inside the printer is dirty and needs cleaning.  This electronic panel is front part of the cartridge with copper “dots”.
The Solution is to try to clean this panel with a piece of folded tissue paper soaked in a bit of methylated spirit. Also try to clean the area in the cartridge carrier/holder that makes contact with the cartridge’s electronic panel (Usually this is more difficult). If you cannot reach it with your fingers, use a stick or something with tissue wrapped around it. Allow to dry well and return the cartridges, close the cover. The blinking should stop if the electronic panel is the issue. Once the blinking stops the printer will print.

SOURCE: How to reset epson stylus d120 waste ink counter?

You don't want to reset the waste ink counter unless you have removed all of the waste ink. Unless you feel like totally dismantling your printer and hand washing the felt pads that are currently soaked in ink you'll probably want to have it serviced professionally or just replace it. Most times replacement is less expensive. Resetting the waste ink counter without cleaning out the waste ink can, and likely will, result in waste ink eventually overflowing out of the the bottom of your machine. Be cautious.

SOURCE: Remove any foreign objects from

Delete all print jobs and turn the printer off. Remove any foreign objects from inside the printer. After a few minutes, turn the printer back on.