Prohibitory sign after repairing privileges from CD

Snow leopard was working. I installed the upgrade on an imac 20 inches.
I started from the CD to verify disk and repair privileges.
When I repaired privileges, one file was bad, i think something related to "core"
I restarted and.... have a prohibitory sign! Imposible to enter the system.
I succeed in entering again my system reinstalling the upgrade of snow leopard
How could it be? What's wrong with my system? Do I have to format the disk and reinstall everything from zero? I'm scared this problm could happen again...
Message was edited by: catburlow

You removed everything from your hardware profile sig that, erroneous I'm sure, said you had a G5, which can't run 10.6.
from the CD to verify disk and repair privileges.
The SL DVD 'ought' to be okay to REPAIR the hard drive, and repair permissions (though ideal is to repair from a 2nd hard drive, such as the one you made with CCC).
Leopard definitely saw changes and doing any type of repair work should be done from the SAME OS version as you are running and not from older versions such as on DVD.
The article on kernel panics recommends some steps, such as clearing NVRAM for when you get a prohibitory sign. And to look at and disconnect everything possible as well - USB and FW devices/cables have been known to cause panics.
Why not repair permissions while booted? won't Disk Utility run, even in SAFE MODE when booted from your clean fresh install? though really shouldn't need to.
As for power failure, I would never run a computer without a UPS (uninterruptable power supply) ....

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First I would like to say thank you ahead of time for taking the time out of your day to read this and try to help me.
I really appreciate it.
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I read some where on the internet that after you update from the original OS you should just use disc utility. I know nothing about this sort of thing, any help on this and the types of utilities I might need would be greatly appreciated.

Maybe this is dumb, but what do you mean by don't believe the hype on permissions repair.
are you talking about the posting I read about not being able to continuously update and boot from the original OS disks, or that repairing permissions is overated as far as system maintanence.
I get a lot of conflicting advise on system maintanence. Thats why I ask this. I'm fairly new to macs and how to keep them going problem free.
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Yes, he can do the same with overkill third-party
utilities that aren't on a bootable disc for which
he's already paid. (And is Disk Utility so hard to
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Hmm. What if he specifically needs a bootable disc
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detailed them.
Bryan:
Don
't believe the hype about running permissions
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Prohibitory Sign, Can't sign in to computer after software update

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Mac OS X- Gray screen or prohibitory sign appears during startup

Macbook 2010 won't boot - flashing question mark, prohibitory sign then Apple icon

Okay so some of this is my fault. We'll get to that later.
A few months back this Macbook my uncle gave me (without the Mac OS X Installer DVDs it came with) failed to boot - displaying the spinning gear/Apple icon/grey screen so many others have experienced.
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So when just this afternoon, I was fiddling with the prompt that displayed whenever you entered single-user mode, trying to move documents from inside the Documents folder into the Applications folder (because I thought that if I did "restore" all over again it would copy needed files into my HD like it did the last time - the /Volumes directory disappeared.
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and also we have this older MacBook (2007 I think) that flashes the prohibitory sign (circle with slash going through it) whenever I try to boot it - started doing that a few days ago and I swear on both laptops that there are no peripherals that are plugged in except for the MagSafe (this older MacBook has no batteries installed since the last one shot out two years ago and we haven't had the money to replace it..)
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Prohibitory Sign on Mac OS 10.3.9 installed onto an iMac 350MHz

Hi.
Mi name is Jose Blanco.
I have an iMac 350MHz which has the Mac OS 10.3.9.
Six mounths ago I installled a new hard drive into this computer and I installed a fresh Mac OS 10.3 onto it.
Yesterday (august, 9) this computer showed the prohibitory sign, consequently I've installed the operating system again and the computer has worked fine until today, that it showed the same issue.
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Hola Jose!
What size is the Hard Drive, and how much space is available?
How much RAM is installed, and is it original or added?
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1.Insert your Mac OS X CD-ROM disc or Restore DVD disc, then restart the computer while holding the C key.
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8.Select Quit Installer from the Installer menu.
9.In the resulting pop-up window, choose restart.
10.After the computer has restarted, you can eject the CD.
Have you run Repair Permissions?
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1.Open Disk Utility, located in Applications/Utilities, and select the startup disk in the left column.
2.Click First Aid.
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New permissions are 33261"
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Prohibitory sign on startup

Hi all,
My G5 froze this evening and I had to do a hard shutdown. Ever since then I get the prohibitory sign on startup (a no entry sign on the grey Apple boot screen).
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I've tried the following:
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Now, here's the odd bit. I then took the RAM back out as it should have then allowed me to boot again but it didn't and went to the no entry sign.
Took out all peripherals, unhooked internal drives - no entry sign.
Have also removed all ram and pram battery, then started up, shutdown, put it all back, then booted again and still the no entry sign.
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Do you have power? Do your drives spin up when you turn on the computer? If you do then,
Try the following:
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger and Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
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Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.
Message was edited by: Kappy

10.5.6 install fails with Prohibitory sign

Since the 10.5.6 update has come out, I've tried multiple times to upgrade to it. All fail after reboot with the Prohibitory sign (and the progress wheel below that still spinning).
I tried upgrading from 10.5.5 and then restored from my Time Capsule three times. I tried downloading the 10.5.6 combo update separately, same results. And after calling Apple support, who told me to rebuild the machine from the install disk, I tried from 10.5.1, same results. Apple support basically said "If you get that symbol and your disks are ok, then you're screwed." My disks are totally fine and the files are all there. Disks have been verified and permissions repaired. I've read through every possible failure scenario on every message board and have found nothing that helps. This is very frustrating.
Only two things I can think of that would contribute:
- I have a software RAID config with 2 drives, standard striped config
- I use Parallels 4.0
Any ideas? Thanks.

wizrdry wrote:
Since the 10.5.6 update has come out, I've tried multiple times to upgrade to it. All fail after reboot with the Prohibitory sign (and the progress wheel below that still spinning).
I tried upgrading from 10.5.5 and then restored from my Time Capsule three times. I tried downloading the 10.5.6 combo update separately, same results. And after calling Apple support, who told me to rebuild the machine from the install disk, I tried from 10.5.1, same results. Apple support basically said "If you get that symbol and your disks are ok, then you're screwed."
Did they really say that?
My disks are totally fine and the files are all there. Disks have been verified and permissions repaired. I've read through every possible failure scenario on every message board and have found nothing that helps. This is very frustrating.
Only two things I can think of that would contribute:
- I have a software RAID config with 2 drives, standard striped config
- I use Parallels 4.0
Any ideas? Thanks.
Lose the RAID and lose the Parallels and see what happens. Install Leopard on a bare, clean machine. If it does not install, then call for a genius appointment.

Prohibitory sign after repairing privileges from CD

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