Startup disk disappear from the desktop

Well, without any reason, The startup disk is disappear from the desktop.
(Just only the startup disk)
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,
it shown the hidden status in disk utility and could not mount it,
So I formatted and back to install old Tiger.
Everything's fine. that's really good Operating system.
Bad luck, about 2 months ago, My iMac G5 had some problem with motherboard and the harddisk also damaged, I send it to Apple Thailand, They fixed it and send back with installed Leopard inside my new hard disk.(well... again)
Now after a few weeks. it happen again.
Startup disk disappear from the desktop.
This problem never exist on my Mac Pro, just with the iMac G5.
(Please don't tell me to check the finder preference about the sidebar setting.
it's already set to show every items there even the iDisk)
I wondered why I don't see anyone have problem with this.
I'm really want to find the answer about this.
I asked this question to Apple Thailand's support team but they didn't have any idea.
Who's gonna answer this

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 /
(note it says "hidden" instead of "-")
To fix this, type:
sudo chflags nohidden /
and provide your admin password. You won't get any output back from the command but the icon should now appear on your desktop, and the hidden flag should go away if you repeat the 'ls -lOd /' command.
And just in case you missed it above, you've got to be sure Hard disks are turned on in Finder General Preferences under "Show these items on the Desktop"

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