Thunderbolt port color problems with panasonic plasma tv

I have a MBP 17" latest model. When I connect my Panasonic 50" Plasma via Thunderbolt to HDMI adaptor through a Western Digital 6TB Thunderbolt hard drive, the colour is very pink/purple. If I plug the HDMI adaptor to the Panasonic direct to the MBP Thunderbolt port, bypassing the hard drive port, the color is fine. Any solutions guys?