Moved servers, everything seems to be working, cant login

[rob4448585]

Wasn't getting much luck on .com so i thought i would try the smart folk on .org

Hey all.
I have just switched to a new server.
I have everything setup working just fine it seems.
the forum is up i can navigate and read.
When i go to login i get to the login screen
http://xxx.com/forums/login.php?do=login
it says

thanks for logging in please wait while you are redirected..........
i am then back at the index screen as a guest.
I have tried loggin in 5 times and nothing different.
Tried IE, FF, Chrome
All with their cookies cleared.

Any suggestions?
maybe a javascript or something im missing?
I am logging into the server via an IP address 123.456.789.012 i have read where it makes a difference on the domain level with www and without.

same issue happens with the admincp.