Shalom,
Are you sure its G2 and not G5?
This server if its a G5 may not be supported on the OS by HP. Which means use RH 5 at your own risk.
I've installed it on a few older 1U servers at work and its reasonable but clearly not ready for prime time.
I'm sorry your not happy with HP support. I've actually found them to be very good. If you voice your concerns to your Representitive from HP, you may get better support.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com