When I use installer 2006.0 and create filesystems: /boot/ /dev/hda1 swap /dev/hda2 / /dev/hda3 installer mounts only /boot filesystem root filesystem on /mnt/gentoo was not mounted
You'll have to provide us with your /tmp/installprofile.xml and /var/log/installer.log from the install attempt for us to help you at all.
Reopen when you have some information for us.
Moving to Release Media/Installer.