Several oddities here that need clarifying...
OS8.2? I assume you mean 8.1 or 9.2? (8.2 was a rare beta).
How did you manage to change the startup disk in the first instance? I don't know of anyway to change it to an audio CD!
If the Mac can't find a system folder on the CD it should look elsewhere.
Your vague error message sounds like it is actually booting from the HD but is crashing for some reason. What were you doing before it went wrong?
Suggest you start from a CD with a system on it, so you can diagnose the HD.