I am trying to connect my Macbook 4.1 Black to my Samsung UE50F6400 using a mini DVI to HDMI adaptor

I bought the UE50F6400 samrt TV. It has 4 HDMI ports. HDMI 4 is HDMI/DVI, HDMI 3 is normal, HDMI 2 is (ARC) and HDMI 1 is (STB).
reading the connection diagram it shows Laptops are to be plugged in to HDMI 4 (HDMI/DVI). But when I plug a HDMI cable in and the other end to the adpator while the mini DVI connection is in the Macbook DVI port. All that happens is the Macbook (4.1 black) screen just flashes blue. This is the same for HDMI 1 & 3, however when it is in HDMI 2 (ARC) the Macbook screen displays. I tried switching TV of and rstarting macbook but still no display on TV. I tried changing display setting such as resolutions and refresh rate on the display preferences and still no display on TV.
Please can someone help?
I am think I may have to return the Mini DVI to HDMI cable and get a HDMI to DVI > DVI to mini DVI and do it that way, means buying 2 adaptors.

You have the display set in Extended Desktop mode with the MacBook as the main screen. The Menu Bar and Dock will be on the MacBook display and your background screen on the TV but you can move the cursor onto the TV screen.
In System Preferences>Display on the MacBook screen there should be an Arrangement tab when you have the MacBook hooked up to the TV and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor. That will make the second monitor your main screen.
The TV will now have the Dock and Menu Bar and windows will open on it. But you can move the cursor to the MacBook screen and move windows from the TV over to the MacBook screen.
You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse.  http://support.apple.com/kb/HT3131 When you disconnect from the TV your Menu Bar will automatically change back to the MacBook.
Or if you want to work on the MacBook screen while showing it on a TV you can check the Mirror Display box on the lower left hand side of the Arrangement tab under the two monitors box. That will give you the same screen at the same resolution on both the MacBook and the external monitor.

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