I don't know, how will you react on my answer, as you have tried every possible solution to solve the problem. Now, the cause for this problem are as follows. Defective or blocked printhead, defective or low ink cartridges and due to defective logic board, which controls each and every fuction of the printer. Now, as you tried almost every solution to solve the problem and still having the problem, it means the problem is caused due to logic board, it is a very rare case, but it happens sometimes.
Unfortunately the replacement cost of the logic board will be more than the price of a new printer, as the model is outdated. So, it is my personal openion that, you should replace the printer, instead of trying any further to solve the problem.
I am very sorry for this answer, but I cannot provide you anything less than the true facts, which I have gathered from my working experience.