Prohibitory sign on startup please help

I have tried safe start and also holding comand-shift-p-r several times with no success. I am currently trying to repair disk in disk utilities but keep having difficulty. My SMART status is verified and I'm unsure what is meant by select OSX volume from submenu. When I hit repair disk I get "Error: Live file system repair is not supported.. PLEASE HELP!!!

I have figured out what the volume is but it will not let me repair permissions
HELP

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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).
I've followed Apple's instructions to reset pram and nvram, and replace mach-kernel, but I still can't boot from either of my internal drives, nor the CD drive.
I've tried the following:
Boot from HD1 - no entry sign
Boot from HD2 - no entry sign
Boot from Tiger DVD - no entry sign
Unplug HD drives - no entry sign
Remove 2 of 4 RAM modules - no entry sign
Unplug all peripherals, including drives, remove all but two sticks of RAM - boots from DVD
Plug back in drives and peripherals but not RAM - works fine
Shut down, install RAM - no entry sign
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.
By the way, I've reset the PMU twice during the evening, reset PRAM and NVRAM numerous times.
Target disk mode works fine so am able to recover data, and disk utility and diskwarrior report few errors, if any.
Does this point to a major hardware failure somewhere? Can anyone help pin this down?
Many thanks,
Justin

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.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
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

Getting prohibitory sign at startup. Have tried everything!!!

Using early 2008 MacBook with 10.6.3. Getting prohibitory sign at startup. Repaired HD through startup disc. Still getting sign. Any last ditch suggestions?

Do you still have your Snow Leopard install CD?
If yes, you could try booting from the CD and running Disk Utility > Repair drive, but most likely you will have to install Snow Leopard over your install. While this should not harm your data it's highly advised that you backup first.
Because you can't boot into your drive, in order to do this you would need a bootable drive. You would need to install OS X on the external drive and boot from that drive. Download SuperDuper and make a clone backup.
SuperDuper! http://www.shirt-pocket.com/
You can select to use Disk Utility to erase the internal drive and install OS X. You can use migration to bring over your data from the clone backup.
If you meet the requirements and your software will run under Mavericks, you might choose this time to make the move.
Check out your software here:
App Compatibility Table
http://roaringapps.com/apps:table
The two most common app that require updates are Microsoft Office 2004 and Older versions of Adobe CS. No app that requires Rosetta like Apple Works will run under Mavericks.
OS X Mavericks: System Requirements
To install Mavericks, you need one of these Macs:
          ▪          iMac (Mid-2007 or later)
          ▪          MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
          ▪          MacBook Pro (13-inch, Mid-2009 or later),
          ▪          MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
          ▪          MacBook Air (Late 2008 or later)
          ▪          Mac mini (Early 2009 or later)
          ▪          Mac Pro (Early 2008 or later)
          ▪          Xserve (Early 2009)
Your Mac also needs:
          ▪          OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
          ▪          2 GB or more of memory
          ▪          8 GB or more of available space
Hope this helps!

When attempting to convert pdf to word doc, I continually get "An error occurred while signing in" despite the fact that I'm already signed in. Please help if you can?

When attempting to convert pdf to word doc, I continually get "An error occurred while signing in" despite the fact that I'm already signed in. Please help if you can?

Hi lorrelaws,
Do you receive that error when you try to sign in via Reader? If so, try signing in via the web interface. Did that do the trick?
Let us know how it goes.
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Sara

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Hello, I have changed my apple password recently. But when I am trying to install application it is showing your password is incorrect. But I can sign in . Please help me?

Hello, I have changed my apple password recently. But when I am trying to install application it is showing your password is incorrect. But I can sign in . Please help me?

Hey tulgan,
This link will provide information on what to do after you change your Apple ID:
Apple ID: What to do after you change your Apple ID
http://support.apple.com/kb/HT5796
Welcome to Apple Support Communities!
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Delgadoh

Prohibitory sign on startup + wifi not working

A few days ago my 2011 MBP refused to boot and froze at a prohibitory sign on startup. I tried SMC resets, PRAM resets etc, but to no avail. Then I've managed to get it to boot a few times, usually after opening it, removing and fiddling about with the HD a little (yes, makes little sense to me too). But now it says Wifi: no hardware installed. I tried renewing the DHCP lease like someone suggested, but that just resulted in Wifi disappearing from the list of network connections...
Verify disk said the disk seems ok. Verify permissions, however, seems to freeze the system.
If I restart, it most likely boots into the prohibitory sign again.
Now I wonder, could these issues be related somehow, the prohibitory sign (points to a faulty HD, I gather) and the Wifi? Or could it be a software issue? I just want to know whether I should replace the HD and wifi or just get a new Mac.
Also, this is so rare that I have to share: these issues started on the day I was meant to hand in a project I've been working on for a couple of weeks (no backups of course, because why would my 4-yo laptop ever fail me?). But, it happened only after I delivered the project. Ha! And when it did boot again, I managed to do a full backup, including three years of unique family photos. Ha! again. A dark day at the satanic IT department, I expect.

maho76 wrote:
The HDD seems to work normally via USB, though it's rather slow. I suppose that could just be a slow USB connection in my very cheap enclosure?
Exactly, the USB2 connection is the bottle neck.
I'll see if I can find a replacement SATA cable, I hope it's just that...
Though not the cheapest alternative, but the Apple store can do this and it should not break the bank.
Ciao.

Hardrive Icon interrupts normal Startup - Please Help

Tonight upon starting my macbook, instead of the normal startup process it instead stayed at the gray screen and in place of the Apple symbol and the loading icon, there was a picture of the Macintosh HD with the word "Hardrive" under it. I turned the computer off and restarted, it started normally as it has always done. I've had this laptop for a year and a half and it has not done anything like this, it has in fact been the best computer I've had so far. Please help me, these things make me very uneasy and I worry about fixing them.
PS: I only really found one post with an almost identical case to mine that was posted back in December. Some theories in that thread included loose hardware inside the laptop, or for whatever reason the computer not knowing where to boot up from. I just got done with a 2 hour trip in the car that had a few bumps along the way - could this have caused the problem? Again, hope to hear an answer soon. Thanks for any help.

No USB keys, no DVD's connected either?
I recall the OLD OS 6-9 would have a similar situation when a faulty HDD or Mount issue occurred.
Try to repair the internal HDD with the DVD, or there should be a way to boot-up with no extensions or startup items.

Computer stops after startup, please help!!!

Hello,
I am trying to fix my MacBook... but I have been having some difficulties and need some help. Whenever I startup my MacBook Pro it takes about one or two minutes at the gray screen with the apple logo and "spinning loading thing." After that it takes me straight to a black screen where it says nothing, but then "disk0s2: 0xe0030005 (UNDEFINED)." comes on the screen. Then after it says, "-sh: /var/root/.profile: Input/output error" and then it will, after about 3 or 4 of the UNDEFINED lines, say "-sh-2.05b#"
Could anyone PLEASE help me?
Thank you very much for reading.

Try this
Boot holding down Apple/S and don't let go until you see scrolling text.
When that stops and you see a root#: prompt enter
fsck -fy
Let it run through all the checks and repairs.
If it fails first time, at any time, or finds and fixes a fault - run the command again and keep doing so (some fixes can take several passes) until it says "Appears to be OK" then enter
reboot

Prohibitory sign at startup / Brand new MacBook Pro 2011

Hi guys,
maybe you can give a little more info about this.
I purchased my MacBook Pro 15.4” QC i7 2.0GHz last Tuesday and right away I put an Intel SSD in. A few days later I got a 'prohibitory sign' error. I have read the support article for this.
My SSD is INTEL X25-M SATA2 SSD 160GB 2.5" RETAIL (SSDSA2MH160G2R5). After when I first got the sign I formatted my SSD (Zero out data) and installed Show Leopard from the DVD. All seemed fine, even the boot time shrank from 40-50 sec to 15. And a day later I got the 'prohibitory sign' again. So now I'm confused... The SSD is compatible with Mac. The only thing I discovered today is that a new firmware is available for the SSD. Maybe this will solve the issue?! Note that this sign appears randomly. After when I got the sign I forced shut down and after turning it on again the startup went as it should... So most of the time everything works fine, but sometimes I get the sign.
Have any of you experienced something like this using Intel SSDs?
Thank you.

i have had my macbook stolen before
the apple store people will say you cannot do anything
you have to call tech support, its the tech support people that will flag your serial number on your laptop
unfortunately with you laptop only being a few minutes new, and they probably stole the whole thing with box and components you have a lower chance of ever retrieving it,
i feel for you man, i know what it is like to get your mac stolen

I tunes 5 error on startup -- Please help!!!!!!!

I have tried nearly everything on here and have even contacted the useless Apple. I too have downloaded I tune 5 and since then I cannot open it. I get the message it has encounted a problem etc.. I have removed all and reinstalled every version and also downloaded quick time on its own and still no joy!! I dont have any firewalls etc and am ready to bin the poxy thing!! Any birght sparks out there with a genius solution. please please help!! Apple were not useful and blamed my computer!! cheeky

hi mark!
this procedure has been working for a lot of these problems:
b noir, "itunes has encountered a problem. help please?" #8, 04:10pm Sep 18, 2005 CDT
keep us posted on your progress.
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PLEASE HELP!

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Mbp freezing at startup, please help!

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Try this
Boot holding down Apple/S and don't let go until you see scrolling text.
When that stops and you see a root#: prompt enter
fsck -fy
Let it run through all the checks and repairs.
If it fails first time, at any time, or finds and fixes a fault - run the command again and keep doing so (some fixes can take several passes) until it says "Appears to be OK" then enter
reboot

Prohibitory sign on startup please help

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