It was a nightmare when we lost central administration website.
All other websites worked fine.
When we click "Central Administration 2010" we got only,
We had to use command to get this up & running
(1) Run Command prompt
(2) cd C:\Program Files\Common Files\Microsoft Shared\W
eb Server Extensions\14\BIN
(3) C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN>
Psconfig -cmd adminvs -provision -port 33633 -windowsauthprovider onlyusentlm
Here 33633 = Port number of central administration website
It takes little time & finally you will get your your central admin site :)
Easy Work now :) :) :)