Hi,

If you are not able to sign in then take a look here

http://www.google.com/support/orkut/bin/topic.py?hl=en&topic=14011

If your home page is not loading then,

1.Check your internet speed and connection.

2.Clear your browser's cache and cookies
http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=32050

3.Try another broweser (Mozilla, Chrome, Safari)
http://www.google.com/support/orkut/bin/answer.py?answer=69553&topic=10290