Brand new A655 Satellite Laptop will connect to new Vizio lcd but not older Plasma tv via HDMI

Hey guys,
So i just purchased a brand new Toshiba Satellite A665-S5183X and It works great with my new smaller bedroom LCD TV via HDMI and automatically connects when I plug in the HDMI.
HOWEVER, my older HP 42" Plasma connected via HDMI will not recognize each other.  The TV says it isnt receiving signal and the laptop isnt showing a 2ndary display in the graphics settings.  The HDMI cord works and I watch COX via HDMI to the older plasma tv.....
what gives???

sorry, let me say im for the most part tech savory. So the FN+f5 only shows the laptop display and not the tv.
If i carry the cable into my bedroom for the newer Vizio LCD tv, the computer automatically detects it and connects it. It is seen in FN+F5 or the graphics control panel.
When i do the same for my main older plama tv, it wont detect it. Nor does my plasma tv sense a signal from the laptop....something must need updated....but what??

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