Non printing epson c20ux

Cleaning only helps if there is still ink in the cartridges.
If you print the nozzle check, you can see what colour is having problems to print.
And when you are sure there is still ink in the cartridge, you could try to remove the cartridge, and in the printer, where the cartridge was, you could put a drop of cleaning fluid in the nozzle on the bottom. Then try printing one or two pages on full colour, till the ink starts coming through.

Be aware, sometimes just a bit of dust is traveling wit the print head, blocking the ink too. But then you see smear on the paper.
Always be sure the underside of the print head does not have debris traveling with the head.
Almost impossible to see, but epson sometimes delivers special cleaning paper. It is a pice of paper, with a special pice of sticky tape. Sometimes it comes with the Ultra Glossy Photo Paper. Use it.

why dont try with a new black cartridge. may be the cartridge is falty.

Try "Nozzle cleaning" and if the problem persist, try "Deep nozzle cleaning". Try them only once or else the ink will run out very quickly.
If the ink cartridges are not genuine Epson, remove them and buy genuine cartridges. If needed, repeat the procedure with them.
Non-original consumables very often clog the printhead.

After few head cleaning, ink counter running low, so ink ligh (red) flashing. Then ink counter runing out, so the light stayed on. After replacing both of ink, red light stayed on, because the compatible ink (chip) not recognized by printer. Check epson status monitor. Use original ink or refill and reset ink level counter.

check printing preferences there can be check click on print in gray scale

your yellow colour is used mostly please refil your colour cartridge or change your colour cartridge.

try a damp tissue on the bottom of the cartridge as there could be some ink dried up on there preventing the flow. ear buds work well to.

In a confused situation like this, it is very easy for the computer to mis-report the amount of ink left in the cartridges. The reason for this is that the printer determines the amount of ink left in the cartridge by counting the number of ink "shots" when printing, head cleaning etc. This information is stored in the "chip" on the cartridge. Thus, it is not an actual measurement of the ink left, but an estimate calculated by subtracting the total shots from the original full ink quantity. This estimate can sometimes be grossly in error, usually due to a cartridge replacement not being carried out correctly etc. The best way out of this situation is always to start from a known position i.e. that you have a set of full cartridges. So, get a complete new set; save the old ones - you can use them later when you know where you are.

Install a new set properly, such that an ink charging cycle takes place, Now run a nozzle check (right click the little printer icon in the bottom right corner of the screen and select nozzle check). Is there any sign of ink on the paper. If not, try up to three cleaning cycles. If ink is now flowing, but not yet perfectly, don't carry out any more cleaning cycles. Just leave the printer for 24 hours (to allow any air in the print head to disperse). Then repeat the cleaning cycle/wait process. It may take a while to restore a perfect nozzle check print.

If this fails to work, you can try soaking the print heads for 24 hours (or more), as follows. Turn the printer on, and as soon as the print head moves out of its parking position, pull the power cord out of the back, or turn the printer off at the mains. You may now carefully move the print head by hand over to the left hand side out of the way. Look inside the print head parking area on the right and you will see a small rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water. DO NOT USE TAP WATER. Carefully push the print head by hand fully into its parking position so that the cup full of fluid comes up over the print head. Do not turn the printer on at any stage in this process. Leave this for at least 24 hours, then turn the printer on and try a head clean/nozzle check again. If nothing, repeat the process once more. If still nothing, post a new comment detailing what you have done and the results.

Regarding your old cartridges, buy a chip resetter on e-bay (currently one for sale at £3.25). Reset all your old cartridges to "full". Tape up the outlet nozzles and save the cartridges When cartridge change time comes, use the old cartridges. If they work - fine, use them until the ink disappears, then chuck them away.

The red light is not on or flashing, is it? You did, of course, remove the yellow plastic tape from the cartridges before installing them, didn't you?

OK - the first thing we must ensure is that you have good cartridges. The printer Status Manager (SM) does not actually measure how much ink is in them, it merely estimates it by counting the number of ink shots used and calculating what's left. There are many reasons for getting this wrong. So we must start from a known good position i.e. new cartridges. Put new ones in, but you MUST use the proper cartridge exchange procedure so that an ink charging cycle is carried out. Now try a nozzle check. Any sign of ink? Yes, but not perfect? If so, or if nothing still, do a couple of head cleans and nozzle checks. If still not perfect, let it rest for 24 hours to disperse air bubbles. Then repeat the head clean etc. Patience is required here.

Still nothing? OK - let's try cleaning the nozzles. Turn the printer on, and as soon as the print head moves pull the power cord out of the back, or turn the printer off at the mains. You may now carefully move the print head by hand over to the left hand side out of the way. Look inside the print head parking area on the right and you will see a small rubber cup that comes up to cover the print nozzles when the head is parked (to stop it drying out). Use a syringe or dropper to fill this cup with head cleaning fluid or distilled water (available from you local car accessories store). DO NOT USE TAP WATER! Then carefully push the print head fully into its parking position by hand so that the cup full of fluid comes up over the print head. Do not turn the printer on! Leave this for at least 24 hours, then try a head clean & nozzle check again. You may get some strange colours to start with - don't worry about this. However, if still nothing, repeat the soak procedure. If still nothing after this, report back.

In view of the original poster's lack of interest, I think we can call this one "Solved by Poster".