updating 9.1 on os x partition kills os x


i just booted os 9.1 on my os x partition and updated it via the update control panel. when i tried to reeboot into os x i got a black screen with text in the top 2 inches with the last line saying "we are panicing in here" i cant type anything and the only thing i can do is to restart the machine. i've booted up using the os x cd and used the disc first aid but it doesn't fix the problem . can any one help me
problem resolved
had to select mac os x disc in startup disc then click the arrow and select the mac os x folder. usually nstartup disc manager lists both folders but it didn't this occasion