DO NOT ENTER sign on boot up

I was organizing some audio files when Finder froze up. I had no option but to reboot, but then when I rebooted an internal drive wouldn't appear... as though it's vanished. And now I can't even boot up because I get a DO NOT ENTER symbol on start up.
Help! What is happening? I've tried Disk Utility and Tech Tool Deluxe. Both say everything on the main System drive is fine.

See Mac OS X: "Broken folder" icon, prohibitory sign, or kernel panic when computer starts
http://docs.info.apple.com/article.html?artnum=106805
 Cheers, Tom

Similar Messages

How to boot when I get the "do not enter" sign

I am working to help a colleague that gets a "Do Not Enter" sing on boot-up of an iMac that was purchased through the university that we work with. From reading other posts, it was suggested that we re-install the OS to overcome the issue; on the assumption it is created by a corrupt file. This has proven not to work and we still get the same "Prohibited" sign during the start-up process. When Disk Utility is run, the boot sectors appear to fine and do not require specific repairs. Disk permissions were also repaired, but neither process has helped or corrected the problem. I am curious if others have encountered this issue and whether there is an easy work around? I came across one potential cause/solution - a bad SATA cable - however, I am unclear how the recovery disk could boot and run if the IO cable was bad, or even if the HDD was failing and working only intermittently. Any help/solution would be much appreciated. Thanks.

I suspect you have eithter a corrupt or failed HD. Attempt to restart, when you hear the startup tone hold down the Option key, then choose the Recovery Partition and open Disk Utility. Try to repair the HD, if it comes up with errors after 2-3 passes then you know the disk needs to be replaced.

Do Not Enter Sign on Macbook Pro. 2010 13 inch

Hey Guys,
1.5 years into the life of my MBP and somethings gone wrong. Was getting the Mac out of sleep and it froze so I hard rebooted it, and it went to normal start up and then the Do Not Enter Sign came up and after googling it, tried everything. When i go into Disk Utility from the disc, it doesn't see the hard drive, only sees the disc itself. Weirdly, i dont know if anything's wrong with the hard drive since I have boot camp on the Mac, and I can log windows and even access the Macintosh partition and take files out. if anyone has any ideas, greatly suggested.
thanks.
JM.

It sounds like the prohibitory sign is indicating a kernel panic at start up:
http://support.apple.com/kb/TS1892
Here is another link that may help in troubleshooting:
http://www.thexlab.com/faqs/kernelpanics.html
Good luck!

"Do not enter" sign after iDefag finished

My wife's MacBook Pro (17") running 10.6.8 was sluggish so I ran iDefrag 2.1.1 successfully. It was still sluggish so I ran it again. (Both times restarting using the prompt in iDefrag.) The second time it successfully finished the defrag but when I restarted the MBP the Apple appeared at initial startup, the grey wheel spun for a bit and then another grey screen appeared with a grey "do not enter" symbol and the grey wheel spinning eternally. (The "do not enter" sign/symbol is a circle with the slash through it.)
I have booted her MBP as a target disk connected to my MBP (also a 17" running 10.6.8). I can see and access everything on her hard drive no problem. I tried rebooting my MBP using her MBP and I get the same "do not enter" sign.
So I ran Disk Utility from my MBP and it said "the volume appears to be OK."
So I bought and ran DiskWarrior 4.4 (I had DW 4.0 but it wouldn't run on 10.6.8). It says that the "drive is functioning normally".
I then used DW 4.4 to "Repair Disk Permissions" and "Check All Files & Folders" and it reported:
Open error 18446744073709551594: "unknown error: -22" on usr/libexec/postfix/error
Open error 18446744073709551594: "unknown error: -22" on usr/libexec/postfix/qmqpd
Open error 18446744073709551594: "unknown error: -22" on usr/libexec/postfix/trivial-rewrite
Open error 18446744073709551594: "unknown error: -22" on usr/libexec/postfix/virtual
...then a bunch of others with the same Open error number.
Then it said that a bunch of .plist (Epson, HP and others) cannot be repaired.
Then I rebuilt the directory and it said: "All file and folder data was easily located." "Comparison of the original and replacement directories indicates that there will be no changes to the number or contents of files and folders."
Still the same problem at startup... "do not enter".
So I restarted holding command-v to see what it had to say and it reported numberous things, such as:
Can't load kext com.apple.driver.ApplefileSystmeDriver - failed to resolve library dependencies.
kext com.apple.driver.AppleFileSystmeDriver failed to load
Kext com.apple.iokit.IOAHCIBlockStorage - library kext com.apple.IOKIT.IOStorageFamily not found.
kext com.apple.driver.AppleFileSystemDriver failed to load (error 0xdc00800e)
The other kext that failed to load with the same error are:
com.apple.iokit.IOSCSIMultimediaCommandsDevice
com.apple.iokit.SCSITaskUserClient
Then I get:
Couldn't alloc class "IOSCSIPeripheralDeviceType05"
Couldn't alloc class SCSITaskUserClientIniter"
The OS install disks that came with this MBP are 10.6.3 and when I tried to do a re-install it said that it couldn't install on this Mac. So I thought that I'd install Lion and see if that fixes things but I can't find it on the store (maybe because Mountain Lion comes out next month?)
Any suggestions?

Kurt Lang wrote:
OS X doesn't need repair
Please tell me you don't seriously mean this. There is no file system in existence that will not have at least the occasional problem.
Right, and Disk Utility is there for that purpose.
Outside of corrupted caches that the free OnyX takes care of, one doesn't need anything more really.
File systems and the files themselves can be damaged in a myriad of ways without having physical sector or other hardware related problems.
And Disk Utility is there for that too.
File systems and the files themselves can be damaged in a myriad of ways without having physical sector or other hardware related problems.
Sorry, just don't see that, that's what backups are for.
There have been many cases in these forums alone where DiskWarrior was able to repair a drive's files or file system well enough for a user to at least back up their personal files when Disk Utility either declared the disk okay, or couldn't fix it.
I don't see it much used around here actually and if it was a seriously viable tool, I certainly would have incorporated it.
I've been using Mac's since day one, fixing them plenty and never had a need to use Disk Warrior, in fact I've had only one hard drive fail on me and it was due to mechanical reasons, it just died.
I don't know of any Apple geniuses that use it, nor any of the Mac computer repair techs that use it.
What I do see is desperate users eager to grasp at a software solution that buy it, like they buy iDefrag or other software promises to "speed up" a Mac, like MacKeeper.
IMO the large proportion of DW users have much bigger problems that they really should be replacing the troubled portion or zero erasing and reinstalling instead.
Sorry, I'm just not sold on DW.
Ask Linc Davis about his opinion on Disk Warrior, see what he says.

Some how do not enter sign was added beside contact, now all messages previously received messages are gone and no new messages from this sender will appear.

I have been receiving messages from this sender fine and then all of a sudden for some reason there was a do not enter sign beside her name. I didn't know how or why it got there, some button got bumped or the mouse, and I didn't know how to take it off so I just left it. Since then, thunderbird has been reopened and all messages that I had received have disappeared and no new messages from this sender appear even though I know she has sent them to me. I have checked into filters and I have none set so it is not that. I can't figure out how the do not enter sign got beside the contact, but I'm sure it's the reason for my problems and I don't know how to fix it. Thanks

In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see [[How do I create a screenshot of my problem?]]
Once you've done this, attach the saved screenshot file to your forum post by clicking the '''Browse...''' button below the ''Post your reply'' box. This will help us to visualize the problem.
Thank you!

MSI Z87-G45 Gaming not entering setup or boot menu

Please someone help, I am getting no setup or boot menu, case & CPU fans come on, drives come on, led's come on, but blank screen.
I took out the graphic card & ram sticks, pulled the plug for leds & case fans, took all cables off HDD's, now only cpu & one stick of ram in dimm 2 connected + power switch.
plugged vga cable direct in MB, blank screen, then plugged cable in MB HDMI, blank screen.
tested monitor, ram & power supply in my sons computer which is a x58 LGA1366, all worked well.
I have no means of testing motherboard or cpu.
specs:
MB: MSI Z87-G45 Gaming
CPU: i5-4670k
RAM: Crucial Ballistix Tactical 1866MHz 9-9-9-27 1.5v
PSU: Corsair CS650M
I also tried another PSU a Thermaltake AP850W
P.S.
I have reset all i.e. pulled plug, taken battery out, pressed reset & shorted the two reset pins next to battery.

newer board are different they need at least a CPU to even show a code as they use that to activate the BIOS and if they do not have that it will FAIL to post anything as the board is used as a backbone as nearly all the important stuff is on the CPU itself (Processor, IMC, SATA controller, Network Controller, VRM (on Haswell), GPU and many other things) so it will fail to post as before it was only a processor but now there more of a system on chip really and has most of the important stuff that used to be on the Board itself so without that the Motherboard is just an electrical plane with impressively limited connections as all the good stuff is now on the Processor that you do not have!
There is not much that you can tell till you at least get that CPU as the board has nothing to work with as there is nothing to process the signals from the BIOS so its just a useless item so shows nothing.

Circle Slash "Do Not Enter" on boot after iDefrag

I ran iDefrag last night because my MBP was running sooooo slow. I barely ever use it and it has 300 GB of free space. I used to use OnyX to optimise the disks on Snow Leopard but I didn't see that option in Lion. I let iDefrag run and went to sleep. This morning I woke up to the Do Not Enter sign and the spinning thing below it. I made sure I left it plugged in so I don't understand what happened.
How do I fix this and not lose my data?

boblaudermilk wrote:
I ran iDefrag last night because my MBP was running sooooo slow. I barely ever use it and it has 300 GB of free space. I used to use OnyX to optimise the disks on Snow Leopard but I didn't see that option in Lion. I let iDefrag run and went to sleep. This morning I woke up to the Do Not Enter sign and the spinning thing below it. I made sure I left it plugged in so I don't understand what happened.
How do I fix this and not lose my data?
Despite some software developers claims, Macs do not require defraging and therefore the cause of the system slow down will be found elsewhere. It sounds, unfortunately, that your HDD may have been ready to die and iDrag just put the final nail in it. Unless you can get it to mount by repairing it with something like DiskWarrior, then I would think, given that it sounds like you have no backup, that you may be in some trouble here. Do you have any form of backups?
Pete

No enter sign after PRAM and PMU reset

I have an ibook 900, 14 inch, which is having video problems,so I reset the PRAM and PMU and now it restarts to a blue screen with a '?' in a folder. I try to restart in target mode but my G5 will not "see" the ibook. I have tried the c and x start up procedures along with the O F command to get into openfirmware (which does let me enter "printevn, mac-boot"), but still after the chime at startup I now get the gray screen with the apple and spinning icon then the apple turns into a do not enter sign. Have I toasted the ibook? I have looked at many discussions, and followed many links, HELP!

Do you have the original install disks? You might need to run the Apple Hardware Test. It sounds like the hard drive is no longer available. This could be due to either a hardware or software problem. You could test the hard drive with the AHT or test the file directories with the Disk Utility on the Mac OS X installer to figure out what's going on.
-Doug

Z87-G45 will not boot unless I enter BIOS or boot menu

Hi,
I v got some problem with my Z87 - unless I enter BIOS or boot menu(F11), I v got error message "Reboot and select proper boot device....".
When I enter BIOS(or boot menu), and dont change anything, exit&save it boots just OK.
The boot priority is simply the OS drive as 1st and everything else disabled. Every single driver is up to date (using supplied live uptade for board (v1.7 bios), and official inter drivers for OS drive (intel SSD), sound, graphics,... everything). Nothing but mouse, keyboard and LCD is connected to the PC. No DVDs inserted, no USB flash drives. Win7 64-bit clean(except drivers ofc) installation.
Any ideas what might be the problem?

Quote from: ondrej.byrtus on 09-May-14, 01:57:58
Hi,
I v got some problem with my Z87 - unless I enter BIOS or boot menu(F11), I v got error message "Reboot and select proper boot device....".
When I enter BIOS(or boot menu), and dont change anything, exit&save it boots just OK.
The boot priority is simply the OS drive as 1st and everything else disabled. Every single driver is up to date (using supplied live uptade for board (v1.7 bios), and official inter drivers for OS drive (intel SSD), sound, graphics,... everything). Nothing but mouse, keyboard and LCD is connected to the PC. No DVDs inserted, no USB flash drives. Win7 64-bit clean(except drivers ofc) installation.
Any ideas what might be the problem?
I am under the impression that this not a fresh build...did you remove recently any drives....do you have dual boot....?

I used Time Machine to recover my Pictures folder. This created a folder called Pictures (original) but I cannot open it. There is a do not enter roadsign, red disk and white bar on it. How can I see the contents?

I used Time Machine to recover my Pictures folder. This created a folder called Pictures (original) but I cannot open it. There is a do not enter roadsign, red disk and white bar on it. How can I see the contents?

Repairing the permissions of a home folder in Lion is a complicated procedure. I don’t know of a simpler one that always works.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
chmod -R -N ~
The command will take a noticeable amount of time to run. When a new line ending in a dollar sign ($) appears below what you entered, it’s done. You may see a few error messages about an “invalid argument” while the command is running. You can ignore those. If you get an error message with the words “Permission denied,” enter this:
sudo !!
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up.
Next, boot from your recovery partition by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
When the recovery desktop appears, select Utilities ▹ Terminal from the menu bar.
In the Terminal window, enter “resetpassword” (without the quotes) and press return. A Reset Password window opens. You’re not going to reset the password.
Select your boot volume if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select  ▹ Restart from the menu bar.

My Ipod Touch (4g) does not enter itunes.

If I plug my ipod in my computer. Itunes is supposed to start but it doesn't anymore.
Also if I start Itunes by myself, my Ipod does not enter it.
There is no sign that my Ipod is connected to my Itunes, so I can't synchronise it.
I've already tried to re-install Itunes and many other things but it still doesn't work.
I really hope someone can help me.

Try
iOS: Device not recognized in iTunes for Windows
I would start with
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
or
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
New cable and different USB port?
Runs this and see if the results help with determine the cause
iTunes for Windows: Device Sync Tests
Try on another computer to help determine if computer or iPod problem

Windows 8 does not have a USB boot option

QuestionHow can I boot my Windows 8 laptop from a USB device? I created a recovery disk on a USB thumb drive.
So far I have:
Entered into the UEFI (BIOS) and set USB to boot first.
Disabled secure boot.
I tried to reboot using the general setup options for startup in the windows settings page. I choose boot from USB through the UEFI, but got an error message that system does not have a USB boot option.
To confirm I also created a bootable DVD with an ISO burner, but my laptop cannot detect a DVD boot option either.
I assumed that the firmware of the UEFI for this computer allowed a bootable USB but in practice I cannot seem to get this work.
AnswerTo assist with not being able to boot from a USB device on a Windows 8 laptop, perform the following:
Plug in USB bootable device.
Hold down F12 when restarting and access UEFI menu (option is below drive list). If system is set to fast boot, CLICK HERE for instructions on entering the UEFI.
Go to UEFI and make USB "1st boot".
Disable secure boot.
Go to the "Advance" Tab, select "System".
Change boot order from UEFI to CSM.
Save changes and exit (F10).
Computer will restart and boot from USB drive.
When finished go back into the UEFI and set defaults then save changes and exit (F10). Windows 8 will reboot normally next reboot.

Done that, only choices are "Set up Firefox to Sync" & "Pair a Device". No ''UNLINK THIS DEVICE". Your turn.

Dhcpcd does not start automatically on boot

Hi everyone,
I have just installed Arch (64 bit) and am running on a dynamic, wired connection.
I followed the Beginners' Guide and enabled the dhcpcd service during the installation so that it would start automatically on boot.
systemctl enable [email protected]
However, I currently must issue the command "dhcpcd" each boot before the internet starts to work.
Does anyone know how I can automate this process or if I need to further configure my network connection?
Thank you in advance.
Last edited by Ipozya (2012-11-15 11:29:05)

foppe wrote:
Check the output from
# systemctl status [email protected]
to debug the issue you're experiencing.
% sudo systemctl status [email protected]
[email protected] - dhcpcd on eth0
Loaded: loaded (/usr/lib/systemd/system/[email protected]; enabled)
Active: failed (Result: exit-code) since Tue, 2012-11-15 20:38:16 GMT; 27 sec ago
Process: 244 ExecStart=/sbin/dhcpcd -A -q -w %I (code=exited, status=1/FAILURE)
CGroup: name=systemd:/system/[email protected]/eth0
Nov 15 20:37:47 arch dhcpcd[244]: eth0: sending IPv6 Router Solicitation
Nov 15 20:37:47 arch dhcpcd[244]: eth0: sendmsg: Cannot assign requested address
Nov 15 20:37:47 arch dhcpcd[244]: eth0: broadcasting for a lease
Nov 15 20:37:51 arch dhcpcd[244]: eth0: sending IPv6 Router Solicitation
Nov 15 20:37:55 arch dhcpcd[244]: eth0: sending IPv6 Router Solicitation
Nov 15 20:37:59 arch dhcpcd[244]: eth0: sending IPv6 Router Solicitation
Nov 15 20:37:59 arch dhcpcd[244]: eth0: no IPv6 Routers available
Nov 15 20:38:16 arch dhcpcd[244]: timed out
Nov 15 20:38:16 arch systemd[1]: Failed to start dhcpcd on eth0.
Nov 15 20:38:16 arch systemd[1]: Unit [email protected] entered failed state
Dhclient did not work automatically on boot either.
Others seem to have experienced similar issues but I don't see any real solutions in any of these posts, despite being marked as solved. For example, adding "-t 120" to the dhcpcd start line in /usr/lib/systemd/system/[email protected] did not work for me.
I also tried the following but it did not work either and I had to issue "dhcpcd" before internet started working.
Install and configure wired and wireless networking
# pacman -S netcfg ifplugd
# cd /etc/network.d
# ln -s examples/ethernet-dhcp .
Make sure the WIRED_INTERFACE and WIRELESS_INTERFACE lines is uncommented
# nano /etc/conf.d/netcfg
# systemctl enable net-auto-wired.service
# pacman -S wireless_tools wpa_supplicant wpa_actiond dialog
# systemctl enable net-auto-wireless.service
https://bbs.archlinux.org/viewtopic.php?pid=1176656
https://bbs.archlinux.org/viewtopic.php?pid=1189587
https://bbs.archlinux.org/viewtopic.php?pid=1180192
Last edited by Ipozya (2012-11-15 21:08:03)

Remove Enter Sign in External Table

Dear Gurus,
I have external table with show 'enter sign'.
I thought it was blank space but not.
How to remove it?since function TRIM can't remove it.
Records delimited by newline -> is that any syntax to prevent enter sign appear?
Thank you
Regards
JOE

This seems to be a TOAD issue - pl ask in the TOAD forums - http://toadworld.com/Discussions/tabid/824/Default.aspx
HTH
Srini

What Are the Security Implications of not Completely Signing Database?

Hello everyone,
What are the security implications of not completely signing the database?
From http://www.archlinux.org/pacman/ ,
The following quote implies that the database exists merely just in case hand tweaking is necessary:
maintains a text-based package database (more of a hierarchy), just in case some hand tweaking is necessary.
However, considering that there are cases that pacman's local database needs to be restored, there are implications that the database is essential for pacman to function properly.
From https://wiki.archlinux.org/index.php/Ho … l_Database :
Restore pacman's local database
Signs that pacman needs a local database restoration:
- pacman -Q gives absolutely no output, and pacman -Syu erroneously reports that the system is up to date.
- When trying to install a package using pacman -S package, and it outputs a list of already satisfied dependencies.
- When testdb (part of pacman) reports database inconsistency.
Most likely, pacman's database of installed software, /var/lib/pacman/local, has been corrupted or deleted. While this is a serious problem, it can be restored by following the instructions below.
I know that all official packages (from core, extra, community, etc.) are signed so that all files should be safe, but I'm just paranoid.
What if the database was hacked? Will this lead to installation of harmful software?
Sincerely,
Cylinder57
Last edited by Cylinder57 (2012-10-15 03:42:31)

Cylinder57 wrote:
From this quote:
Allan wrote:But, the OP (also?) talks about the local package database on his computer. That is not signed at all as there is no point. If someone can modify that, then they can regenerate the signature, or just modify any other piece of software on your computer.
Is it going to be easy for anyone other than the authorized user to modify the local package database?
Allan basically answered that with the quote above already as I understand it. Someone who has access to the installation, e.g. is able chrooting your PC via USB, is not held back by any ACLs. However, modifying the local database only makes limited sense because the packages are already installed. Pacman would only recheck, if you re-install a package. The only really relevant attack vector for the package database is
(1) installing an older package with a vulnerability,
(2) re-placing the up-to-date package sig in the local database with the older one and
(3) modifying the system, e.g. via pacman.conf excludes, to not update that.
then also re-installing would not create a sig-error and you get stuck with the bogus old package.
With a signed database this would not be possible. However, as Allan wrote earlier also with a signed database that criminal can manually install (totally leaving pacman & package cache) whatever it needs in this scenario. So, if you are -really- paranoid about that, you probably want to spend (a lot of configuring) time with something like the "aide" package.
Cylinder57 wrote:
And, are the following statements correct:
If the repository databases are modified, the hacker might be able to modify the packages on the server (Considering that if someone can modify the local package database, that person can modify any other piece of software on that particular computer.)
However, pacman won't let users from installing the modified packages (due to package signing,) unless at one person with access is bribed (at least, for an individual package.)
I don't know the intricacies of the server infrastructure - only saw they have great names :-), but I am pretty certain your statements assume that correctly. It is pretty unlikely that someone able to modify the central repository database fails at placing a bogus package for shipping with those access rights at this time. Yet it does no harm not to post any details of such a scenario here imo. In any case: A compromised mirror would be enough for that - and easier to achieve (hacked anywhere or e.g. in a non-democratic state). Plus you also answered it yourself. The keys are key for our safety there. Which keeps me hoping that no criminal lawnmover salesmen frequent the Brisbane area.
As you put up a thread about this, one question you can ask yourself is:
Have you always checked on updates new signatures keys which pacman asks about? If you ever pressed "accept/enter" without checking them out-of-band (e.g. the webserver), that compromised mirror database might have just created a "legitimate" key .. user error, but another attack vector the database signing would catch.
edit: Re-thinking the last paragraph just after posting, I now believe it would not be that easy as implied - simply because the bogus key is not trusted by one of the master keys. The pacman pgp trust model should catch that without database signing. At least it would if only the official repositories are activated, but that's a pre-requisite to the whole thread.
Last edited by Strike0 (2012-10-20 23:01:26)

DO NOT ENTER sign on boot up

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