Today, I logged in to SO on a new PC, and found my rep back at 101 with all activity erased. Any idea how to recover it?
That means you accidentally created new account at http://stackoverflow.com/users/740957/ray
here is your original account:
See how to request an account merge on How can one link/merge/combine/associate two accounts/users? (Anonymous/unregistered/cookie or OpenID/registered)