How to debug failed Active Directory operation

Hi,
I am trying to open Microsoft Exchange 2007 Management Console on the Exchange 2007 server. However, I keep getting an error message saying "Active Directory operation is failed." It looks like this:

Can anyone help me fix this problem? Thanks!
Error:
Active Directory operation failed on "Full Computer name". The supplied credential for "ServernameUsername" on Bind operation is invalid error Code: 0x31.
