Connecting Mac Pro to LCD and TV LCD Problems

I have a 22" Gateway LCD that works perfect with my mac and I just recently bought a Mini displayport HDMI connection that I wanted to connect to my Sony 46" HD TV.
Now, everytime i connect it and I boot up my macpro it will freeze at the login and causes weird things to happen on my screen leading me to Hard reboot. The only way to stop it is if I disconnect the HDMI port from the tv and reboot. If I connect it while the computer is on, it wont be as dramatic with freezing but you can tell the computer is not acting like it should.
I tried connecting to a different TV and its the same thing.
What should i do??
Thanks for reading,
Angel

It's probably the mini display-HDMI connection, the thing itself.
An odd thing happening I've found is that the mini display port is preferred by the Mac as the start up display. So, I'm wondering if the Mac doesn't find what it expects if that might be a problem.
Still, I bet a DVI to HDMI connection would produce better results for you. No guarantees though.

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