root authentication using rsa key

[Nimit Gupta <nimit@deeproot.co.in>]

hello,
     i am trying to configure sshd, so that root can login using rsa
     key, the idea works fine for normal users but for root it does not,
     what could be the reason?

     AuthorizedKeysFile     %h/.ssh/authorized_keys

     if in earlier line i replace %h with ~ then i cant authenticate
     anyone neither normal user nor root.

     i also tried,

	PermitRootLogin without-password
     as i read at some site but still it doesnt?

with regard,
nimit