Yup I agree with that, we need to get the server run through diags and we also need to know firmware and OS patch, revision and release levels. The only other thing that would be nice is to know exactly what you have connected to and installed in the server itself.
Perhaps the following outputs might help:
1. prtdiag -v
2. Messages (if there are any relevant)
Is your OS a standard OS as installed from the CD or has it been customized in some way to fit into some site requirement(s). Perhaps some packages have been left out, or some third party packages have been installed. Just a though.