Google Product Forums
Re: Problem with your Nexus booting up w/ Android 2.3? Post here
Sep 30, 2011 12:51 PM
Posted in group:
Google Mobile Help Forum
Glad I could help! I know the frustration of having an expensive phone that doesn't work. This restored it 100%.
To others, this link is for the Nexus One only as it restores the factory boot image and overwrites everything. I'm sure there is a site where you can get the boot image for the Nexus S.