Black circle with a line through it when trying to boot up
Hi! I've got a PowerBook 12". I was able to install the OS, and boot it up, but upon installing the 10.4.11 update and rebooting, it goes to the Apple icon, then eventually the Apple icon is replaced by a big circle with an line through it and the computer stalls. I've tried different hard drives and different hard drive cables with the same result. I've reset the PRAM/PMU, removed the RAM, etc. At some stage in either the OS install or the .11 update, I always get the circle.
I was able to successfully boot the machine from another hard drive via firewire, with the remote machine in target mode. The fact that that works, to me, indicates that the drive or drive cable inside the machine is bad, but like I said, I've ruled that out by testing multiple known-good drives and cables. Is it possible that the IDE bus on the laptop is going bad?
Anyway, I'm just wondering if people have any ideas. Also, does anyone know what the difference is between the circle with the line, and the flashing folder with the question mark?