Failed to reboot the OS from the hard drive. Re-powered and the Finder Icon from OS10 appeared and flashed with a question mark on a folder icon..

In a cave
Osco

The FAQ with the 4 key press didn't bring the prompt to change the boot priority?

in a cave

Quote:

Would like to help you, but need more info about what is happening and what you are trying to do. I assume that you finished the MOS2.4 installation and that you have your MacMini set up for a dual boot with MOS2.4 and MacOSX.

From what you wrote above, I am guessing that you might have corrupted your MacOSX partition, if you are seeing a folder with a question mark where the MacOSX partition should be, is this correct?

As for your second post, I don't know which FAQ you are referring to, or what 4 key press.

No dual boot Mac Mini dedicated to MorphOS :)
MacOSX gone I think
I think that the Mini is looking for the MacOSX which is not there.

http://www.morphos.de/faq.html

Booting on Mac mini G4

Q: How do I change the boot arguments ?
A: Mount the HFS Boot partition with Mounter application found in Tools. Open the bootinfo.txt in your favourite text editor and find the
<boot-script> line. It should be something like: boot &device;:&partition;,\boot.img ramdebug

Now add your boot arguments after the ramdebug keyword and save the file. You need to call HFSSetMacBoot Boot:bootinfo.txt EACH TIME you modify the bootinfo.txt or your Mac mini will not be able to boot MorphOS!

Q: What does HFSSetMacBoot command do ?
It marks files as bootable by OpenFirmware, making a partition appear as bootable in OSX and OpenFirmware's boot menu.

Q: How to get to the OpenFirmware prompt ?
A: Press and hold Command + Option + O + F keys after you hear the chime sound.

Q: How to eject a CD before booting anything ?
A: Enter the OpenFirmware prompt and type 'eject cd'. You can continue booting by typing 'boot' or reboot with 'bye' or 'reboot-all'.

Q: Why do I need a HFS partition for the MorphOS boot.img file ?
A: Mac mini's OpenFirmware can only read HFS or HFS+ partitions, so it wouldn't be able to load the boot.img from a FFS or SFS partition. HFS is the only Mac filesystem with write support under MorphOS.

trying again: : Press and hold Command + Option + O + F keys after you hear the chime sound.

RTFM:

Troubleshooting for Mac mini G4 users

Q: My Mac mini doesn't boot, all I get is a gray Stop sign. What to do?
A: This may mean that the selected boot.img file or the filesystem Mac mini boots from is corrupt. Boot MorphOS from the CD, mount the HFS Boot partition with Mounter, format it using Ambient's Format menu (remember to name it Boot) and copy files found in mac_ppc32 directory on the CD to the freshly formatted Boot: partition. Now open a shell and type 'HFSSetMacBoot Boot:bootinfo.txt'. Finally, eject the CD and reboot.

Q: My Mac mini doesn't boot, all I get is a blinking disc icon. What do I need to do?
A: It may be that the HDD wasn't detected or that its partition table is damaged. In case you have your data backed up, the best way would be to try reinstalling MorphOS. You may also want to run HDConfig from Tools to see if the HDD is detected and has the proper partition layout.

Q: My Mac mini doesnt't boot, all I get is a black screen / my monitor doesn't power on. What are my options?
A: Try to erase the nvram. This is done by holding Command + Option + P + R keys after hearing the chime sound after you power on the mini. You should keep the keys pressed until you hear the Mac reboot itself again. Even if the chime sound was previously muted, you should hear one now.

Q: I tried erasing nvram, but it doesn't help. What else can I do?
A: You may try the same key combination, but this time power the mini off, hold the Command + Option + P + R keys and press and hold the power button with your third hand. Keep all keys and the power button pressed until you hear the Mac mini reboot again.

If this does not help, you should probably send the machine to your local service center.

Q: My Apple USB keyboard does not appear to work. Why is that?
A: We have successfully tested Apple's A1048 and M7803 keyboards but discovered compatibility issues with the A1242 and A1243 models, which at present have to be considered incompatible with MorphOS.

Did you try holding down "alt" while booting? Sometimes Macs can get confused regarding boot volume if something has changed on the drive (this happened to me while playing around with boot camp). After booting using alt I could set the "new" OS X partition as the bootable one and it worked.