Good day ALL

I have a problem on Sunfire V880 which I replaced the Motherboard last week. At first the system complain about the temperature which I also told the customer on my arrival. now the Aircon is fixed but the system hanged and System Fault LED came on after this:
Hardware Power On

Probing core system FRUs.. Done
Executing POST w/%o0 = 0000.0800.0101.2041
0:0>
0:0>@(#)Sun Fire[TM] V880/V890 POST 4.30.4.c 2010/09/29 10:25
/export/delivery/delivery/4.30/4.30.4.c/post4.30.4-micro/Camelot/daktari/integrated (root)
0:0>Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
0:0>Jump from OBP->POST.
0:0>Diag level set to MIN.
0:0>Verbosity level set to NORMAL.
0:0>
0:0>Start selftest...
0:0>CPUs present in system: 0:0 1:0 2:0 3:0
0:0>Test CPU(s)....Done
0:0>Init Scan/I2C....Done
0:0>Basic Memory Test....Done
0:0>Memory Block....Done
0:0>IO-Bridge Tests....Done
0:0>Enable Errors....Done
0:0>INFO:
0:0> POST Passed all devices.
0:0>POST: Return to OBP.
POST Reset

Enabling system bus....... Done
Probing Memory............ Done
Initializing CPUs......... Done
Initializing boot memory.. Done
Initializing OpenBoot
Probing system devices
Probing I/O buses

Enabling system bus....... Done
Initializing CPUs......... Done
Initializing boot memory.. Done
Initializing OpenBoot
Probing system devices
Probing I/O buses
I T J U S T H A N G S H E R E
What can be the problem