Hi, what to do (step by step  

From console, keys not press:
------ Performing the Power-On Self Test (POST) ------
UART Channel Loopback Test........................PASS
Testing the System SDRAM..........................PASS
Boot1 Checksum Test...............................PASS
Boot2 Checksum Test...............................PASS
Flash Image Validation Test.......................PASS
Restoring system configuration defaults
BOOT Software Version 1.0.0.04 Built  24-Oct-2007  18:51:36
Network Switch based on 88E6218 with ARM946E-S.
64MByte SDRAM. I-Cache 8 KB. D-Cache 8 KB. Cache Enabled.
Preparing to decompress...
 100%
Decompressing SW from image-2
 100%
OK
Running from RAM...
About to erase CDB. Terminal baud rate will now be set to default!
********************************************************************
*** Running  SW  Ver. 3.60.28  Date  08-Jun-2010  Time  11:09:16 ***
********************************************************************
Serial Number :  F3DR186000414.
HW version is: 04
Base Mac address is: 00:21:91:0a:ef:37
Dram size is: 64M bytes
Flash size is: 16M bytes
01-Jan-2000 01:01:10 %CDB-I-LOADCONFIG: Loading running configuration.
01-Jan-2000 01:01:10 %CDB-I-LOADCONFIG: Loading startup configuration.
Device configuration:
Slot 1 - DGS-3100-24 ST
------------------------------------
-- Unit Number 1                  --
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Now "Unit Factory Default", but not welcom-username-password..... swith not work internal power supply is disable part voltage