Startup disk setting ignored if starting from off iMac

In order to speed up the performance of my system (2008 iMac 2.8 Core 2 Duo - 24 inches running Yosemite (10.10.2), I have tried to start running my system off of a spare SSD in a Firewire 800 Enclosure. Works fine when I start the computer off of a restart, but when I shut down the system and then start it up again, the iMac automatically appears to revert to the slower, internal HD. System preferences always indicates that the external SSD is the start up disk. No problems show up when running disk utility. Any ideas as to how to solve this problem?

That info is held in PRAM, so the first obvious thing to try is zapping it, and you might as well zap NVRAM at the same time. Shut down (not just a re-boot). Start up while holding down the 4 keys: Command, Option, P, R, releasing them when you hear the third 'boing'. Check Sys Prefs > Startup Disk.

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Startup Disk Does Not Automatically Start on Boot

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Angelo Suerte wrote:
I have a problem booting my system. Everytime I boot or restart my macbook pro, it always shows a selection of what disk to use instead of directing to login page and it's annoying. I already set my startup disk on system preference but doesn't work.
Did you lock the padlock?
I also tried using disk utility and repair the disk and its permission and still didn't work. How can I fix this?
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After errors with disk partition, I removed Windows from my iMac. Now when I start my computer it goes into a black screen and not straight into the Mac area like it used to, unless I hold Alt straight away to give me the option. Any help?

Hi,
Sorry, I'm new to the community, so apologies if I'm repeating myself.
OK, so I tried to install Windows Vista onto my iMac with the disk partition. Everything was going fine and it wasn't until last minute, when it was installed that an error came up saying that this can only be done with Windows 7. After this error, I couldn't access any errors of my iMac and when I shut down and restarted my computer, it automatically logged into Windows.
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Thanks

Solved it. Thank you very much for that!

Startup Disk? Emergency? Starting up from disk?

Hi All, A friend called, he is using panther on a 12" powerbook. I suspect he threw away his HD on the desktop, or moved it to an external HD and now when starting up he just gets the spinning ball. SO... a couple questions. Help would really be appreciated since he is coming over tommorrow morning in 11 hours...yikes!
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Hi Michael
If both computers are firewire enabled you can start up in target Disk Mode, so that his computer is booted from your drive. You will need a Firewire cable.
How to use FireWire target disk mode
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regards roam

Best disk set-up for editing HDV on iMac G5

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I've run Disk Utility and repaired permissions yet nothing is fixed.
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Yes. As I wrote in my first post I am the only account holder in both my OSX volumes, Tiger and Snow Leopard, and in both I have Snow Leopard nominated as the start-up volume. Also, in my Windows XP partition (on the same hard disk as Snow Leopard) I have Snow Leopard nominated as the start-up volume in the Boot-Camp control panel. So everything I can think of in every volume on my machine is pointing towards "start in Snow Leopard", only it seems to be having trouble doing that.
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Hi
I have an iMac that has Bootcamp Windows 7 but I mainly work on Mountain Lion. I'd like to write a script in AppleScript that will access and activate:
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Adapting from here
http://hints.macworld.com/article.php?story=20070126131322301
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Mar 29 10:26:21 xxx-xxxxxxx's-powermacg3series /usr/sbin/update: FIXME: IOUnserialize has detected a string that is not valid UTF-8, " ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ". I am not sure that this is pertinent, however.
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I pasted the solution below:
from a Terminal window, type:
ls -lOd /
(That's lowercase ell, lowercase ess, space, minus, lowercase ell, capital oh, lowercase dee, space, forward slash)
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drwxrwxr-t 32 root admin - 1156 Feb 8 20:35 /
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sudo chflags nohidden /
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If someone torrents a OS X upgrade on your computer how can you restore it without the startup disk

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Startup disk setting ignored if starting from off iMac

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