Strange problem

[midnightmadman]

For some reason my cyan is printing black and my magentas are coming out dark gray. I just printed a few days ago and it was fine.
The only thing I did was change the yellow cartridge that ran out.
Any ideas what happened?

 

[midnightmadman]

Strange. I just pulled from before the dampers and black ink is coming out of the line!
Could my black cartridge somehow have back syphoned into those lines?

 

[midnightmadman]

I pulled ink above all dampers until the right color came out, then pulled through waste lines and everything is back to perfect again.
Very weird!