Hmm, kernel panic (The dialog stating you need to restart your computer).
Yes, there actually is - if you can get it to start booting off of your startup disk. It's not
too difficult after that.
You'll need to hold down option to select to boot from your startup disk. As soon as you hit the arrow to boot from that, start holding down command ( ⌘ ) S so that you boot into single user mode. You may be stuck doing this a few times - the timing is sometimes tricky.
Once you do that, you'll be hit down to the command line. First thing you should do is run
fsck -fy - this will repair the drive (you could be getting the kernel panic because the drive needs to be repaired). Keep running that command until you get a message saying "The drive some_name appears to be OK" - if it tells you something was repaired, just run it again until you get the message telling you it's OK.
After that, type
/sbin/mount -uw / to mount the startup disk as read/write. Then it's one simple command to tell the computer to boot from this drive:
bless -folder /System/Library/CoreServices -setBoot
You can test to see if it worked by doing
bless -info. You should get output like this:
Code:
finderinfo[0]: 2536 => Blessed System Folder is /System/Library/CoreServices
finderinfo[1]: 0 => No Startup App folder (ignored anyway)
finderinfo[2]: 0 => Open-folder linked list empty
finderinfo[3]: 0 => No OS 9 + X blessed 9 folder
finderinfo[4]: 0 => Unused field unset
finderinfo[5]: 2536 => OS X blessed folder is /System/Library/CoreServices
64-bit VSDB volume id: 0x6C2DD3B80DB98386
It won't be
exactly the same, but close.
Once you've got all of that done, type
reboot - then cross your fingers and hope it boots up fine.
If you still get the kernel panic after that, try holding down ⌘ V while you boot up again and see if there are any errors being displayed in the console.
