The drums on the cyan and yellow cartridges are used so you need to replace them. There is no reason to blockage of the cartridges so try a little hard to take them out.
When I print in color, I am getting blue and yellow toner on the left side of the paper (for some reason I can't import this photo right side up).
I tried removing the toner cartridge, and I discovered that the yellow and blue cartridges won't come out--the blue is stuck on its right side and the yellow seems to be stuck on both sides. Black and magenta come out with no trouble.
Any suggestions? I would give up on this old printer and get a new one, but I have a brand new black toner waiting to be installed, and it's too late to return it.