Is my printhead dead?

There is a magenta tinge on all colour prints. The machine is a Canon Ip6600d.

I tried flushing the printhead but with no luck. All suggestions appreciated.

This is a test strip copied from the Web.

This a color print from the Canon, looks like the Reds and Yellows are OK, but the blues
and greens are not there.

This is a B/W version, made by coverting to a Grey Scale Image, the Magenta tinting even
bleeds over into this image.