How to change the HP iLO password on Windows Server 2003:
download and install software from http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=15351&prodSeriesId=254889&prodNameId=342841&swEnvOID=1005&swLang=8&mode=2&taskId=135&swItem=MTX-6370c5233e7b4a89b3aac041d5
open command prompt to C:\Program Files\HP\hponcfg
type hponcfg.exe /w c:\iloconfig.txt to write the ILO configuration to the C:\ drive
open the iloconfig.txt and navigate to <user_INFO MODE="write">
Add the lines:
<mod_USER USER_LOGIN="Administrator">
<password value="newpassword"/>
</mod_USER>
</user_INFO>
Save file
Go back to command prompt and type hponcfg.exe /f c:\iloconfig.txt