Forbidden sign on start-up.

Hi everyone!
When my powerbook starts up, it arrives to the apple logo with the spinning sign. But after a while, the apple logo changes to a forbidden sign!!! What does it mean ?
So I thought it is the hd problem. So I remove it. But the forbidden sign goes back.
I think booting from CD, the machine should read the disk utility even is Hd is removed. Removing the HD should not change the CD start-up process , no ? it is safe I think.
Thanks in advance.
Alain
Powerbook Ti 400 Mac OS X (10.4)

Here's Apple's info on the problem, you can try following the links:
http://docs.info.apple.com/article.html?artnum=106805
With the HD installed, try doing a "safe boot", by holding the shift key down until the login screen appears. If it works, do a normal restart and report back with the results.
http://docs.info.apple.com/article.html?artnum=107393

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