HI Blaise,

Yes I have already checked with VV command that SCIP 2.0 and FIRMWARE 3.3.
Laser is working , this is clear from below given.

vros@powerbot:~$ rosrun hokuyo_node hokuyo_node
[ INFO] 1278719145.793650000: Connected to device with ID: H0507384
[ INFO] 1278719145.892535000: Starting calibration. This will take up a few
seconds.
[ INFO] 1278719148.983078000: Calibration finished. Latency is: -0.0840
[ INFO] 1278719149.806085000: Streaming data.

while running rviz command for visulaziation, I got some errors given below
[please note that I am getting the same error if I just call $rosrun rviz
rviz]:
vros@powerbot:~$ rosrun rviz rviz -d 'rospack find hokuyo_node'
/hokuyo_test.vcg
[ INFO] 1278719927.352134000: Loading general config from
[/home/vinaypilania/.rviz/config]
[ INFO] 1278719927.353486000: Loading display config from
[/home/vinaypilania/.rviz/display_config]
rviz: OgreGLSupport.cpp:57: virtual void
Ogre::GLSupport::initialiseExtensions(): Assertion `pcVer && "Problems
getting GL version string using glGetString"' failed.

I searched for rviz troubleshooting they have reported the same error there
saying that some graphics driver problem with ubuntu. here is the
linkhttp://www.ros.org/wiki/rviz/Troubleshooting