Thanks and my two cents
Thanks to all of you on this thread, I was finally able to connect my Macbook 2008 to Samsung 46" HDTV just purchased. I have summarized the steps I took below for my self (I had to check the Mirror Displays box on Mac preferences per below, without which the connection did not work--that is my only addition to the advice you all gave). Thanks!
To connect Macbook (2008) to Samsung HDTV (2011):
1. Shut down the Macbook and HDTV (no need to disconnect power cord).
2. Connect adapter/cables:
a. Video from mini-DVI port on the Macbook, to the HDMI/DVI (Port #1, lowest) on the Samsung HDTV, and
b. Audio from headset output on Macbook, to PC/DVI Audio In port just below the HDMI/DVI input on the Samsung HDTV [Do NOT use AV Input port closer to the center of the Samsung HDTV].
3. Power up the computer first and, when fully done, then the Samsung HDTVso the Samsung HDTV can recognize the Macbook when the HDTV is powering up.
a. If the Samsung HDTV is not on HDMI/DVI (Port #1), press SOURCE on its remote and scroll to this port.
b. The Macbook screen will appear on the Samsung HDTV
c. But text, audio or video on the Macbook may not appear on the HDTV. If this happens, do the following:
4. On the Macbook:
a. Click on System Preferences
b. Click on Displays
c. Displays, Arrangement, Color will appear on the screen
d. Click on Arrangement
e. Two overlapping screens will appear
f. Check the Mirror Displays box at the bottom of the screen
g. Text, audio and video on the Macbook screen will appear on the HDTV.
h. You are done!