Startup Disks missing from Preference Pane - Help!

I have my Macbook partitioned with boot camp and I can start up in both Windows or OSX by holding down the option key and I get to choose my system.
However, in my preference pane for Startup disk, they only option that appears is Network Startup. Neither OSX or Windows appears there. This has only occurred since the last update. I haven't changed anything in my system in months.
So I now have to wait for an extra 2 min or so, while the macbook searches the network for a bootable drive before it finally decides to start in OSX.
Anyone have any ideas how to get my drives back in the Startup Disk preference pane?
Any help you can provide would be welcome.
Thanks.

Oh, I wish that had worked, but unfortunately they do not appear with any other user either.
I really don't want to do a complete reinstall of both systems. I hope I can figure out another way to fix this.
Message was edited by: Chris Echlin

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Well, without any reason, The startup disk is disappear from the desktop.
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I found this 2 times before, once on my 8 cores Mac Pro, once on my iMac G5.
I couldn't do anything to fix them, so I formatted and re-install OS.
with my iMac, it ran Tiger before, there's no problem until I changed to Leopard,
After about 2 weeks under the new Leopard,then the startup disk disappear from the desktop,
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Everything's fine. that's really good Operating system.
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it's already set to show every items there even the iDisk)
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I found a solution to the problem and posted it here:
http://discussions.apple.com/thread.jspa?threadID=1858340&stqc=true
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)
You should get something like this:
hostname:~ username$ ls -lOd /
drwxrwxr-t 32 root admin - 1156 Feb 8 20:35 /
Sounds like you might see something like this instead:
hostname:~ username$ ls -lOd /
drwxrwxr-t@ 32 root admin hidden 1156 Feb 8 20:35 /
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To fix this, type:
sudo chflags nohidden /
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There is question mark sign on startup disk in System Preferences on Mavericks of Macbook air 13inch (Early 2014). I can't find any solution for this. Could someone please help me find the solution. I know that something went wrong and I don't know how to fix it.

I think I now understand your concern. This is from my MBP System preferences display:
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I thought this would be a question easily answered on the WWW and easily found via search engines, but so far no luck, hence this question.
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Ok, so I am an idiot. <crickets chirping>
Ok so no new's flash there. Apparently no universe either..."on own, on own....".
Here is my problem...
Here is the solution...
And there are the triangle thingies again...the visual cue I was missing was the tiny little label shown below circled in blue.
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Callsign: Alaskan boy.
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You're most welcome. Glad to help!
PS: You may want to mark my earlier post above as Solved as it solved your problem and may help others with the same problem that find your topic know the post that contains the answer. Click the Solved button in that post above.
Marking posts that are helpful or solve the problem as Helpful or Solved, respectively, aids others in finding answers and awards points to those who take the time to respond. See "Why reward points?".
Marking a topic as Answered indicates the question is resolved, but only you, as the person who asked the question, can mark posts as Helpful or Solved. The "Answered" status neither awards points nor provides an indication to others of the posts that were either helpful or solved the problem.
Additionally, the new "Yes/No" buttons do not assign any points: they merely collect statistics for Apple, a very confusing change recently made to the Discussions.
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Startup Disks missing from Preference Pane - Help!

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