Switching Domains

I have decided to switch the domain I have hosted with the 9.95/month plan. I have both deactivated and deleted my old domain and have directed my new domain’s name servers to point to dreamhost. However, when I attempt to add the new domain as fully hosted, nothing happens. I first get the message that the domain has already been registered and that the nameservers need to be changed, which was already done a few days ago. I then click “Continue to add service” and it redirects me to a blank screen. HELP!!! I need my new domain working ASAP!!