Usually indicates poor toner. Have you had your toner replaced recently. Refilled toners are notorious for this. I have had this problem before....replaced toners with a good supplier or manufacturer. Problem solved.
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Shaking these cartridges does nothing except give you a little exercise. If this is a brand new HP cartridge you are having problems with I would return it to the store you purchased it from. HP brand cartridges should not give you these problems right out of the box. The print defects you are seeing are due to a dried up or clogged print head. If you like you can try hydrating the print head on a water soaked paper towel until the ink starts flowing, but there's a risk you will cross contaminate the colors.