Next, gather information from the service call or the on-site personnel.
Events that occurred before the failure
Whether any hardware or software was modified or installed
Whether the server was recently installed or moved
How long the server exhibited symptoms
The duration or frequency of the problem
If possible, make one change at a time to isolate potential problems. In this way, you can maintain a controlled environment and reduce the scope of troubleshooting.
For more information, see Information to Gather for Troubleshooting.