Booting the installation CD
Insert the Gentoo installation CD in the CD-ROM and boot the system. During startup, press Stop + A to enter OpenBootPROM (OBP). Once in the OBP, boot from the CD-ROM:
The SILO boot manager (on the installation CD) is then started. Hit Enter for more help. Type in gentoo and press Enter to continue booting the system:
Once the Installation CD is booted, a root ("#") prompt will be displayed on the current console. There will also be a root prompt on the serial console (ttyS0).