Computer will not boot up. a circle with a line thru it appears.

All of a sudden my computer will not boot up and a circle with a line thru it comes up. What is the problem and what can I do to fix it?

Hi, master hunter.
The most common meaning of this symbol is that something in the operating system is damaged. Here is the best resource when troubleshooting this behavior.
OS X: About kernel panics
http://support.apple.com/kb/TS3742
If you prefer us to assist you with this issue, contact us here.
Cheers,
Jason H.

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Will only boot to a circle with a slash

MacBook Pro will only boot to the circle with a slash symbol. I have tried all the turn on hold C, X, Option key suggestions and have tried the clearing ideas (hold cntl, commmd, p, r). Have put the system disk in to boot from that, now I cannot get the disk out.
Any suggestions out there?

Your computer is not recognizing your hard drive. Plug a mouse in and hold the mouse key down when booting. The disc should eject. Next, make sure the disc is real clean with no finger prints or scratches on it. Then try booting from it again (by holding the "C" key down) when booting. See if your Disk Utility sees the drive and run that. If it does not, or the unit will not boot from the install disc, then you have a serious problem--possibly logic board-related. You could also try running DiskWarrior and see if that will boot and repair the drive.
Dave M.
MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG

Have a MacBook Pro. the computer will not boot up, the screen has black and white stripes and multi color bands as well.

Have a MacBookPro. The computer will not boot up. the screen has black and white bands with multi color bands as well.

Yeah it's dead. Take it to an Apple Genius Bar and have it checked out. Then buy a new one.

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Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitiion & use Disk Utility from there to Repair the Disk, then Permissions.
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Which computer? Which Windows?
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Computer Will Not Boot

My computer will not boot and it will not enter Safe Mode. I ran the Memory Diagnostic test and it shows that I have a hardware problem. I also tried to restore my computer to an earlier time but it showed an error. I have 1GB or RAM and recently it keeps changing from 512MB to 1023MB. Please help.
Specs (that I know of)
1GB RAM
INTEL CORE 2 DUO 2.43GHz (I'm not sure)
Gigabyte motherboard
OS: WINDOWS 7 ULTIMATE
This question was solved.
View Solution.

try to make shour that the ram is snug and in all th way make shour NOT to jam them in and dont leve a empty slot in betwen them if there craced be shore not to use the in any in the computer check the mother bords slots and the pins on the ram and make shour that theres no dust stuck in there . thats all i can think of hope it works out for u. :^)

Mac will not boot up, white screen with turning gear for hours on end

mac will not boot up, white screen with turning gear for hours on end

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. The easiest way to deal with the problem is to boot from an external drive, or else to use either of the techniques in Steps 1b and 1c to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 9
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 10
Repeat Step 9, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 12
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

I am using AOL and my refresh is on the far left I do not see a small circle with a line through it

Sagebrush - I am using AOL and my refresh is on the far left side of my adress box and I do not have a small circle with a line through it. I am computer dumb so bear with me.please.
Message was edited by: Nana Noland
Mike - I am using Windows 7 and I think my browser is Internet Explorer and I always use AOL to sign in.
Thank you for any help you can give.
Message was edited by: Nana Noland

While AOL uses IE as it's browser engine, it's and older version of IE (IE8) that DOESN'T have ActiveX filtering. Only IE10 and IE11 have the filtering.
BTW: If you have AOL software installed, (unless you're on a dialup connection and you NEED it to connect), you're basically taking up nearly a gigabyte of hard drive space for software that DOES NOTHING that the AOL website can't already do with Internet Explorer, or another browser. I was a "Windows/Mac connectivity specialist" for AOL in 2002 & 2003, and their software is what we geeks call "bloatware", meaning it's FILLED with all kinds of stuff that you'll never possibly use. My advice would be uninstall it altogether. Download Firefox. It's a much better browser than AOL or Internet Explorer. Download and install the Flash Player Plug-in (All other browsers) and the Shockwave FULL Installer (All Other Browsers)
For ALL your AOL content, use your Member name and password to login at http://www.aol.com/ where you'll find your AOL Mail, AOL Headlines, your AIM Buddy List, and EVERYTHING that was part of the AOL software, only it's ALL on AOL's servers, not your hard drive.

What does the red circle with a line thru it mean?

I'm exhausted! Trying to find an answer to WHY iTunes won't allow me to drag a song to my iPod Nano? It was originally an MP3; I unzipped the file; I played it in iTunes song list; it had a ! next to it; iTunes asked if it should find the file; iT found the file; the ! was removed; I played it again in iT; when I tried to drag it to my iPod, THERE WAS A RED CIRCLE WITH A LINE THRU IT???? I have yet to find--i googled and youtubed and appled til my eyes and brain and fingers ached and burned ;(--what the SYMBOL means?!?!?!?!?!?!?!?
I have been able to download similar audio of this nature...Not sure why this one is BLOCKED?
Thank you!

robynlwitheridge
What version of Premiere Elements are you using and on what computer operating system is it running?
From your description "little circle with a line in it", that sound like a symbol when you are trying to do a cannot do operation.
What exactly are you doing in your edit activities when you see this circle with a line in it? Is it at the end of the mouse cursor?
Can you post a screenshot of it?
If my first impression of what this is happens to be correct, then "How do I get rid of it?" answer comes from
a. defining what you want to do
and
b. correcting any mis-steps you are taking in doing that
We will be watching for your follow up.
Thanks.
ATR

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Do you have a backup in the form of a bootable clone or Time Machine? Restore that and then try the update again.
Some things to try here (Safe Boot)
http://support.apple.com/kb/TS2570
Another option might be to download the standalone from Apple Downloads on another Mac and try installing it in Firewire Target Disk Mode to the Mac that was interrupted during the update.
http://support.apple.com/kb/HT1661

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The internal drive is malfunctioning. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
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Sounds like your system is hosed. Try [repairing the hard drive with Disk Utility|http://support.apple.com/kb/TS1417]. Of course, from the sounds of it, even if you get the drive repaired, it may not fix the problems with your system.
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I recently tried to install a series of software updates. Not all were successful. Soon therafter the computer froze up while in safari. I turned it off and the computer would not boot up on restart, and instead sent me to the darwin login screen. I rebooted in safe mode per these forums, and turned off an itunes startup function, and then rebooted. That seemed to do the trick as I could now get back into the OS, but the computer was dreadfully slow. It froze up again in Safari and I turned it off again, and this time it would not go past the grey startup screen with the apple. I tried safe mode again, but the computer would shut down around 30 seconds after the wheel below the grey apple started turning. I Was able to get my Tiger Install DVD in the drive, and turned the computer back on, but now just get the grey apple screen and the wheel spinning indefinitely. I cannot do an erase and install because my photos are not backed up. Please help!
Thanks

Hi, Deaton41. Welcome to the Discussions.
You wrote: "I recently tried to install a series of software updates. Not all were successful."I suspect the only way you are going to resolve this is by performing an Archive and Install. For important tips on this process, see my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order. If you follow my FAQ's steps to the letter, then your photos should be AOK, assuming directory corruption hasn't damaged them. I suspect directory corruption is the root cause of the unsuccessful software updates, which that then led to your current problem re: start up.
Before installing future software updates, you may wish to consider the advice in my "Installing Software Updates" FAQ. Taking the steps therein before installing an update often helps avert problems and gives you a fallback position in case trouble arises.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Computer will not boot up. a circle with a line thru it appears.

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