Monitor "blinks" when i turn on 2nd monitor

Hi. I have 2 monitors hooked up to my graphics card. My first monitor is a Acer 23' and my 2nd monitor is a vizio 19' which is also a tv. I usually just use my main monitor. However when i turn on my 2nd monitor to watch tv or have more desktop space, my first monitor "blinks" (turns black for a second and makes a sound). I was wondering what the problem is and how can i fix it?

This is my first monitor (acer)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This is my 2nd monitor (vizio)
http://www.vizio.com/va19lhdtv10t.html

This is my graphics card
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thanks!