I have purchased a Black ink cartridge for my HP 5520 from both Amazon and Walmart this year and neither one works. It shows ink on the screen but not on the test page. I have talked with a co-worker and he said he had the same problem...went to office supply store and they tested all the same cartridges they had on the floor and none of them worked, Sounds like a huge manufacturing issue and I want my money back. HP is better than this, but I am not seeing anything on the internet about a recall. Any help would be appreciated. This is a first for me and this printer, but it appears to be a problem with history...and yes, they were both HP brand cartridges, not refurbished.