Server :: Hangs At Starting Domino Services During Booting Up?

I joined a company as an IT staff 2 months plus back. I now encounters a problem that the booting up hangs at the time when it is starting domino services. I have no clue where to look at and duno where to start checking. A little description of the server. : It's a lotus notes domino server for employees webmail service. -> Now it is down. it's an external dns server: recently high volumes of query cache denied surfaces. it's also our proxy server. The only way to get it up and running is to turn off domino service. The system is running still with high volumes of queries I last checked.

Althrough it can boot up now and DNS & proxy are running, I couldn't access the system anymore. It will hang when I attempt to log in from the command prompt. Below is an illustration:

iasaix login: root -> I attempt to log in using root user
password: xxxxxxxx -> I keyed in my password
-> The cursor comes down and just keeps blinking and nothing happens.

Remote access is not possible as it has sshd disabled by default. Our employees cannot access their webmail now, which is a major issue.