I've hooked my Pi up to a Zenith TV, model sms2049s. I'm using a converter and VGA cable. Previously I used this setup with a preloaded Raspbian Wheezy card I got from Adafruit, and the display was OK, but I wanted to try NOOBS. Followed the steps in the quick start guide, pressed 3, and now I get a display where the vertical hold is not working. I.e., the image is continuously scrolling down the TV screen too quickly to read. This TV does not seem to have a vertical hold adjustment, and I just searched through a manual for it online but vertical hold did not return any hits. Suggestions?