Wireless Mac Mini with Sony LCD Tv monitor

I am having a similar problem to those mentioned, although my issue is that my desktop and all programs used (excel, word and email, etc) are displaying with a dark purple hue which inhibits clarity and distraction when using my Mac. I have a Sony model number KDL-32L5000 connected to my Mini Mac. The monitor worked great with my Dell PC and the problem occurred only when connection to the Mac through HDMI cable.
These circumstances makes it very difficult to justify the change from PC to Mac as I am encountering several obstacles. I surely could use some help.