服务器 不知什么原因关机了？？？？？？？？

各位大侠，请教个问题，我现有ibm多台服务器， 今天早上来看到服务器关机了， 通过服务器管理口，抓取的硬件日志如下： 不知道是什么原因导致的？  谢谢！！！！！

1 INFO SERVPROC 08/08/11 16:24:02 Remote Login Successful. Login ID:''USERID' from WEB browser at IP@=192.168.70.122'
2 INFO SERVPROC 08/08/11 16:15:10 Remote Login Successful. Login ID:''USERID' from WEB browser at IP@=192.168.70.122'
3 INFO SERVPROC 08/08/11 16:13:30 LAN: Ethernet[0] interface is now active
4 INFO SERVPROC 08/08/11 16:13:01 LAN: Ethernet[0] interface is no longer active
5 INFO SERVPROC 08/08/11 16:09:25 LAN: Ethernet[0] interface is now active
6 INFO SERVPROC 08/08/11 16:06:42 System Complex Powered Up
7 INFO SERVPROC 08/08/11 16:05:31 System Complex Powered Down
8 INFO SERVPROC 08/08/11 11:16:30 System Complex Powered Up
9 INFO SERVPROC 08/07/11 20:50:56 Recovery Ambient non-critical over temperature warning Read value 32.00.
10 INFO SERVPROC 08/07/11 20:17:35 Recovery Ambient critical over temperature fault Read value 35.00.
11 ERR SERVPROC 08/07/11 18:44:23 Ambient critical over temperature fault Read value 41.00.
12 INFO SERVPROC 08/07/11 18:37:50 System Complex Powered Down
13 WARN SERVPROC 08/07/11 18:37:24 Ambient non-critical over temperature warning Read value 38.00.
14 INFO SERVPROC 11/10/10 12:01:50 System Complex Powered Up
15 INFO SERVPROC 11/10/10 11:57:47 System Complex Powered Down
16 INFO SERVPROC 11/09/10 16:02:18 System Complex Powered Up
17 INFO SERVPROC 11/09/10 15:58:26 Eth[0] Link Config: No Link after 10 seconds. PHY Reg 5 = 0x0000. PHY Reg 6 = 0x0004. PHY Reg 24 = 0x0038.
18 INFO SERVPROC 11/09/10 15:58:26 Eth[0] Link Config: No Link after 10 seconds. PHY Reg 0 = 0x1000. PHY Reg 1 = 0x7809. PHY Reg 4  = 0x01e1.
19 INFO SERVPROC 11/09/10 15:58:26 Ethernet[0] configured to do Auto Speed/Auto Duplex.
20 INFO SERVPROC 11/09/10 15:58:26 LAN: Ethernet[0] interface is no longer active
21 INFO SERVPROC 11/09/10 15:58:26 Ethernet[0] MAC Address currently being used: 0xE4-1F-13-32-D0-DF
22 INFO SERVPROC 11/09/10 15:58:26 RSA II Network Initialization Complete.
23 INFO SERVPROC 11/09/10 15:58:25 ENET[0] IP-Cfg:HstName=ASMAE41F1332D0DF, IP@=192.168.70.125 ,GW@=0.0.0.0, NetMsk=255.255.255.0
24 INFO SERVPROC 11/09/10 15:58:25 DHCP[0] failure,no IP@ assigned,rc=-290
25 INFO SERVPROC 11/09/10 15:57:01 BMC Self Test Results: Passed
26 INFO SERVPROC 11/09/10 15:56:56 PS Line Levels: PS1=220V, PS2=220V
27 INFO SERVPROC 11/09/10 15:56:10 Recovery Power Supply 1 DC Good Fault