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.

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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!

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Here is what fixed my wife's phone after several weeks of no wifi. We had removed the Sims card and transferred to another phone which was running ios 6. My son was visiting and said Apple had come out with an update a few days ago and he decided to attempt to install it on the 4s phone that had no wifi and no cellular because the sims card was removed. He tapped the icon to update the new ios version and received the message to the effect that No WiFi available would you like to search for available networks. He selected yes and immediately the wifi came on and has been working now for two days. Also we never installed the update to the new ios.
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Hi:
I can give you the link to the wifi driver, if you do the following steps to post the hardware ID for the wireless card, so I can figure out what model wireless card the notebook has...
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Then click on the Details tab at the top of the Network Controller window.
Now you see a Property drop down list and it is defaulted to Device Description.
Drop down on that list and select the second item (Hardware ID's).
Post the top string of characters you see in the window.

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Prohibitory sign on startup + wifi not working

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