Found this fix under another thread for the Deskjet 1220C. But it worked perfectly on two color cartridges for my 952C (one new from the box!), and should for the rest of the 900 series I think. For all the posts, see the thread: HP DeskJet 1220C Prints only Pink & Black. Here's the summary of how it works from Joe in that thread.
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Anonymous and Kevin from my other post hit it. I took both their ideas. Kevin said he soaked his in hot water and Anonymous said he ran his under hot water. This works. I had 3 cartridges and all three work after doing this.
I heated a cup of water in the microwave for 1 minute 30 seconds and put the whole tip end in the water for about 15 minutes. Then I ran it under the facet with the hottest water that would come out. I did this until I cold see some of the blue on the tip coming out. I was getting Magenta/red the whole time. I then dried everything off very well and let the cartridge air dry for about 1/2 hour.
I installed it and ran the clean function about 4 times and I now have color.
EDITOR'S NOTE: I only had to soak them, not run them under hot water or do the clean function. Just ran a test page and it worked. But if your cartridge is really clogged, you might have to. Also, I re-microwaved the water every 15 minutes or so, so that's another thought for an industrial-strength clog.
Thanks again, Joe, Kevin, Anonymous and all the posters, for your very intelligent and creative solution.
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