If repeated head cleans and all the other tests
do not resolve the problem, then the chances are
it is a dead head.
Whats to do?
If it is still under sellers/manufacturers warranty then that is the route.
If you are out of warranty then these are further things to try.
A REPAIR IS NOT AN OPTION IT IS USUALLY CHEAPER TO BUY THE NEXT MACHINE.
Get hold of a refill syringe set. Or a hypodermic syringe and remove the cartridge.
Endvour to fit the syringe over the yellow nozzle
[ may have to mess about with a fine tube - say a lenth of ball pen refill - empty of course]
in the cartidge bed and give a good set of pumps
If you have distilled water about the place
[ for the iron or car battery-] try pumping that through.
Now refit the cart and see what happens.