it sounds you have a clogged nozzel and the power clean does not clear that nozzel. Therefore it becomes nessecary to do more than just power clean the nozzels. Instead sending the printer back to Epson, you can do the following yourself (I've copied this from an website which does not exist anymore, but the cleaning method remains very useful). You simple soak the nozzels with Windex, that will unclog them. Here is how it is being done:
Quote: "Set the paper thickness lever to '+' or as thick a setting as it will take. Take some tissue (ideally disposable lint-free cloth, perhaps a thin 'sponge' cloth as shown to the right) and fold it up tightly if necessary, but not so that it is too thick for the print head to move over it. You may need to cut a strip of the material as appropriate. Lay it on the black plastic towards the left of the printer - you may find it easier to tape it down at each end (again, not really necessary in our experience if you can get some sponge cloth about 3-4mm thick). You now dampen the cloth with an appropriate cleaning fluid, Windex is very good.
After switching the printer off, move the print head by hand over the damp cloth. Once you can move the head as you will, move the head over the tissue in several smooth passes back and forwards. You will see that ink passes onto the strip. Sometimes it is nessecary to leave the head for a short time over the cloth so that the dried ink in the nozzels are well saoked.
Once you have finished, return and lock the printhead, and return the paper setting to its previous position. This operation will frequently need to be followed by a head-clean utility (power clean) before any improvements are seen, as the rubbing action may pull ink out of the nozzles." Unquote.
This method works well on all printers and had helped me and many others I know who had clogged nozzels on their printers.