system folder will NOT boot

[iknownotwhoiam]

i was using 9.2.1 and i went to the startup disk pref panel and selected 10.1...when i restarted my computer, the system folder thing flashed between a question mark and the mac face.
i modified nothing in either my 10.1 or 9.2.1 system folders.
when i put in my 9.2.1 install disk, it works.
if i try to restart into either 9.2.1 or 10.1 now, nothing happens....just the blinking face and question mark.
does anyone have any ideas about what is going on????

thanks.
axel.

 

[baur]

Holding down option should at least let you get back to you OS 9 install... although I don't know of a way to "fix" a broken OS X install from the OS 9 finder...
I'd love to hear if anyone has any ideas on how to do that.