Install RHEL serever 6.4 on standalone server IBM x5 using kickstart failing

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Hi,

I am trying to install redhat linux server 6.4 on IBM x3690 X5 server. When i insert the rhel 6.4 iso I get the gnu grub menu, I don't get the option to hit the tab key to get to the boot prompt where I can insert my kickstart command.
The grub menu comes up with 3 options

red hat enterprise linux 6.4
install system with basic video driver
rescue
"use the up arrow and down arrow keys to select which entry is highlighted. Press enter to boot the selected OS, 'e' to edit the commands before booting, 'a' to modify the kernel arguments before booting, or 'c' for command-line"

At this point when I press the 'tab' key I don't get the boot option where I can put my kickstart http details.
When I press the 'e' key I get further 2 options:

kernel /images/pxeboot/vmlinuz
initrd /images/pxeboot/initrd.img

I change the initrd to initrd /images/pxeboot/initrdtest and then boot, the server then boots from the DVD. Which then allows me to do a fresh install of Linux. I don't get the option to put my http kickstart details.

I did use the option 'c' to get to the command line I then used the following parameters:

kernel /images/pxeboot/vmlinuz initrd=initrdtest

Next prompt I used:

boot linux text ks=http://server/.ks.cfg ksdevice=eth0 ip= netmask= gateway=

I got further but now get errors like:

VFS: Cannot open root device "(null)" or unknown-block(8.5)
Please append a correct "root=" boot option; here are the available partitions:
kernel panic - not syncing:VFS: Unable to mount rootfs on unknown-block(8,5)

I am new to installing RHEL on a standalone server, I have installed RHEL on a VM with no problems, but am having trouble doing this on a new standalone server.

Please advice.

Many thanks.

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