Update your BIOS! The first round of JS20 had lots of issues booting/installing, update the BIOS. (2.06 is the latest)

1) Download the BIOS

2) Burn to file to a CD
3) Make sure that this blade is the owner of the Media Tray (press the button on the BladeCenter)

4) log into the BladeCenter MM Console...
Telnet "IPAddressOfBladeCenter"

Login as the admin user
At that command prompt connect via SOL to the JS20
console -T blade[XX]

Where XX is the slot number of the blade ie [13]
At command prompt of AIX - login as root
5) Type "diag" at the command line and press enter
6) You are now at the "Function Selection" menu Select "Task Selection"
7) Select "Update and Manage System Flash" (it's the last one on the list) and press enter
8) select "Validate and Update System Firmware"
9) Select removable media, press enter
10) Select the CD ROM drive (/dev/cd0)
11) Commit - F7
12) You will now be asked if you are sure, and if it's ok to reboot Select "Yes"
13) While the system is rebooting, remove the CD from the CD-ROM
*AIX takes a long time to reboot

Committing:

You now need to commit this new image as the permanent system image
1) Log into AIX as root
2) Type "diag" at the command line and press enter
3) Press "enter" You are now at the "Function Selection" menu Select "Task Selection"
4) Select "Update and Manage System Flash" (it's the last one on the list) and press enter
6) Select “commit the temporary image” and press enter This takes around 5 minutes
7) The system will report back with "the commit operation was successful" Press "enter" to continue
8) Press “f10” to exit
9) Then type "Exit" to logout of AIX as root