Short Disk Read error

[vikk at comcast.net]

Hi, I just purchased an Ultra 5 with 128 Megs of Ram and a 8 Gig Hard Drive. I am trying to install Solaris 8 on it and when I boot from cdrom via the command:

ok> boot cdrom

I get a error message saying "Short Disk Read" and than it says "The File just loaded does not appear to be executable".

I am completely new to solaris hence I do not know what to do next. I was trying to install a new CD-Drive as that might be the issue. Can someone please suggest how and what should I do? Thanks