You've installed a CD/DVD-ROM drive (Slim ATAPI connection) into a Sun V100 and now it can't find the drive. Reference manual is here [docs.sun.com]
Start up the system and place a console cable into the first serial port on the platform. (The console cable on the V100 happens to be an RJ45 and is compatible with Cisco RJ45 console cables.)
The default settings for your terminal application are: 9600, 1 stop bit, no parity. To access the console from a Solaris platform, you can use tip.
Allow OpenFirmware to figure out where your cdrom is. The following example demonstrates that the cdrom/dvd appeared on Device 2 from the probe-ide command.
ok boot /pci@1f,0/ide@d/cdrom@2,0:f