Are you using the right image.
Try with the latest Wheezy.
This has a good chance of being caused by trying an image written for the 256 when you need the latest one which does 256 & 512 models.

Noob is not derogatory the noob is just the lower end of the noob--geek spectrum being a noob is just your first step towards being an uber-geek
If you find a solution please post it in the wiki the forum dies too quick