Trouble Connecting Macbook Pro to HDTV

So I just bought a new LG TV and have been trying to connect my MBP to it but to no avail.

I used a Mini Display Port-to-HDMI adapter and then a HDMI-to-HDMI cable to connect to the TV. However, the tv screen says no signal and it just displays the LG sign.

On the other hand, my mac does not recognize the display when the TV is on. Once I turn off the TV, the MBP's screen flashes blue and then it recognizes the TV so I can change settings and stuff in the System Preferences. But as soon as I turn on the TV, the MBP's screen flashes again and then the display does not show up on my MBP at all. When I click "Detect Displays", nothing happens.

I read other posts about connecting a MBP to a HDTV but I didn't find any other post that had the same problem as I do.