FM458 cannot restart

after hardware config ,download to 458, but 458 cannot start to run. the yellow lamp of stop is always light.I hope to know the way to let it run. thank you!

the information of diagnostic buffer:

Diagnostic buffer of module 4581DP

Order No./ Description Component Version
6DD1607-0AA1 Hardware 6
- - - Firmware V 1.1.4

Rack: 0
Slot: 5

Event 1 of 100: Event ID 16# 430E
Memory reset executed
Previous operating mode: STOP (memory reset)
Requested operating mode: STOP (own initialization)
Incoming event
11:49:33.655 AM 12/09/2008

Event 2 of 100: Event ID 16# 4309
Memory reset started automatically (power on not backed up )
No relevance for user (Z1): 0300
Previous operating mode: No voltage
Requested operating mode: STOP (memory reset)
Incoming event
11:49:31.145 AM 12/09/2008

Event 3 of 100: Event ID 16# 494E
Power failure
Previous operating mode: STOP (internal)
Requested operating mode: No voltage
External error, Incoming event
11:49:29.644 AM 12/09/2008