Scrolling TV screen with DVI to Video Adapter

I just purchased a DVI to Video Adapter from the Apple store. When I initially hooked it up (disconnected the monitor, and plugged the new adapter in with TV connected), it worked fine, but the entire screen was not visible.
I tried to change the display preferences while connected to the TV... From this moment on, my screen on the TV continuously and quickly scrolls up in a loop - similar to old TVs that need fine tuning with the horizontal hold or a hard hit on the side.
Is my adapter faulty or is there a setting issue?
Any help would be appreciated. Thanks.

I believe that preference is stored in PRAM.
http://support.apple.com/kb/HT1242
So resetting PRAM as noted earlier should be the method.
However, there may be a supplemental preference file that is involved. I opened two Finder windows to
<startup volume>/Library/Preferences/
<user folder>/Library/Preferences/
and set them to display as a list and to sort by date (most recently changed at the top).
Then, I opened System Preferences Displays pane and changed resolution or refresh rate. The preferences files that changed were.
<startup volume>/Library/Preferences/com.apple.windowserver.plist
<user folder>/Library/Preferences/ByHost/com.apple.windowserver.001b6337b3a2.plist
<user folder>/Library/Preferences/ByHost/com.apple.preference.displays.001b6337b3a2.p list
So you can try move those to the desktop and restarting. The problem is that they may get recreated before you can restart, but if they were somehow messed up, it may work to recreate them.
You can do a test by creating a new admin user account in System Preferences Accounts pane. Log out and log in to the new user. Does the TV work if you are logged in as the new user?
Also, try starting up using the your Mac OS X installation disc, with your TV connected. Does the TV then display properly?

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