The printer goes back a bit. I have had it approximately 4 years, and I bought it second hand, so I don't know how old it really is.
I did another manual cleaning as suggested by Mack, and was able to make one good print. The very next print (only a few minutes later) was badly contaminated.
I used to be able to run a full page of just yellow, and that would clean things. Then I had to do a power cleaning at the start of a print run. Now neither works.
I have been using Inkjetmall carts for quite a while now and have been very satisfied. I don't think they have anything to do with my problem.
Thanks for your response. I will check out your link.
p.s. I just ordered a damper on Ebay. If nothing else works I will try to install it...