I have a Windows Server 2003 Small Business Server that has begun crashing more and more often. The machine does not physically power off(so I don't think it is a power supply issue), but it does not respond to any network activity. When I force a restart by holding down the power button(at 11:43:20 AM), the only relevant Event Log entry says "The previous system shutdown at 3:45:11 AM on 7/21/2009 was unexpected."
This first started about a year ago, when the machine would do this once every 3 or 4 months. Over the last month, it has started occurring more and more frequently, twice in 4 weeks, then twice in 2 weeks.
So, two questions: 1) Any idea what would cause crashes like this to occur? and 2) Are there any ways to get more detailed Event Log entries from within Windows?
I have full current backups of all the data on the server, so I am not worried about data loss. I have regularly updated and scanned Symantec Virus protection managed by the domain.
 Forgot to mention, the server is Service Pack 1.[/edit]
Here is the event log entry, in case it is useful.
Event Type: Error Event Source: EventLog Event Category: None Event ID: 6008 Date: 7/21/2009 Time: 11:43:20 AM User: N/A Computer: <MyComputerName> Description: The previous system shutdown at 3:45:11 AM on 7/21/2009 was unexpected. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: d9 07 07 00 02 00 15 00 Ù....... 0008: 03 00 2d 00 0b 00 90 02 ..-.... 0010: d9 07 07 00 02 00 15 00 Ù....... 0018: 07 00 2d 00 0b 00 90 02 ..-....