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If you touched the electrical contacts on the cartridge the high voltage used could be taking a shorter path to ground. Try cleaning the contacts on the cartridge and inside the printer with a lint free cloth and some 99% isopropyl alcohol then wipe dry.
How does the inside of the printer look? If it is very dirty, then it is possible that the laser scanners are polluted. The other possiblity is that one bad cartridge can cause all colors to print poorly due to the fact that all the high voltage is driven off one board on these printers. If you recently installed a new cartridge, try swapping it out for the old one, if the print quality improves, you have a bad cartridge for sure and should have the store you bought it from replace it.
There are many different companies that sell compatible toner, and the quality varies greatly. You should try getting your money back from the company you bought that toner from, and find a new supplier if you can't get it from Gestetner. Premier is a company that sells compatible toner for many different machines, and they usually get pretty good reviews.
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.
Full isn't always the answer, in order to refill a cartridge properly you need to also replace the cleaning blade inside. The blade wears out and doesn't clean the drum properly and also lets toner leak all over. Your best bet is a new OEM cartridge, or put a new cleaning and Dr. blade in yours.
You need to replace the cartridge. it is faulty. there is a spot on
that cartridge that is not properly magnetized so it is retaining toner
instead of releasing it. you can clean it off but will most likely
continue to have the same problem. Clean it with a lint free cloth or
paper towel DRY. Do not use any chemicals or water if the toner is
salvageable then that would ruin it.