-system -<BR>Powermac 5500/225<BR>OS 8.0<BR><BR>This will boot without extensions. Without bypassng them, the OS starts to load from either the CD or from the HDD but stops before any extensions ...

I have an iMac with OS 10.5. It crashed one day while doing a software update. After that it often hung at the gray screen on start up. When it did go past the gray screen and let me log in, finder ...