Cant ge past grey screen with lock

Hi I think I may have trashed a system file and when I try to reboot I get a grey screen with a big lock symbol that will not accept my password any suggestions much appreciated

A firmware password has been set. If you don't know that password, and you're the rightful owner of the machine, take it to a "Genius" bar to have the password removed. Be prepared to show proof of ownership, if asked.

Similar Messages

  • After running mac tuneup got a red dot on the hard drive icon, nothing would respond, now on restart cant get past white screen with apple logo, mac tune up disk still in laptop

    after running mac tuneup got a red dot on the hard drive icon, nothing would respond, now on restart cant get past white screen with apple logo, mac tune up disk still in laptop

    Restart your MBP holding the trackpad down and hopefully the disk will be ejected.  Then try to return it and get a refund or put it in the trash.  There is nothing that software does for your MBP that you cannot do yourself or with free software.
    If can get your MBP started, delete all traces of the offending software.  Worst case is that you may have to erase the HDD and reload the OS and your user data.  I trust that you have a backup (minus MacTuneUp).
    Courcoul has given you his opinion in a very succinct manner, and as you might surmise, I agree with him.
    Ciao.

  • Grey screen with lock icon

    Macbook not booting properly, install disk nothing, press option on start up goes directly to grey screen with lock and login bar, tried all passwords and ...Nothing
    cannot safe boot. cannot reset PRAM. regular boot startup displays apple icon and spinning wheel.. Have no idea what may have caused issue (not the last one to use it) In other words HELP!

    I was able to do this ! YAY ! I believe I did something incorrectly on the first go with the PRAM reset. I was able to enter Single User Mode with original disk. Yay ! It was indeed the firmware password! Thank you Kappy !
    Following Kappy's steps, I did the following;
    If you're running OS 9, you may need another mac (though i suspect a PC with firewire and a HFS driver would do) and a firewire cable. You will need to delete preferences pertaining to keychain access and any keychains in the preferences folder in the system holder The first imacs ran this so its plausible
    If you're running OS X on the imac
    Single user mode would do the trick unless there's open firmware password protection in place
    To go into single user mode
    Press the power button to start the computer.
    Immediately press and hold the Command (Apple) key and one of the following: the "s" key for single-user mode. (Command-S) This should boot into a white screen, and iirc throw you into a command prompt
    These instructions should work for older versions such as 10.4. Khafshoh S' version works for newer systems 10.5 and better - 10.7 also has yet another option for resetting the password involving the 'resetpassword' command in lion recovery.
    Instructions for changing the password are based off of Apple's documentation though the documentation goes very in-depth.
    You would then mount the file system as writable with
    mount -uw /
    then find out what the accounts on the system are with
    ls /Users/
    then change their passwords with
    passwd username
    reboot and get back into graphical mode with
    reboot
    Then check the accounts to work out which one is the admin account.

  • Macbook Pro won't boot past grey screen with Apple logo and then shuts off

    This is a long story...
    This morning, I would turn it on and it'd go to the grey screen with the Apple logo for a few seconds and then go to the icon that is a circle with a line through it. After reading online, I was able to boot it up in Safe Mode. I messed around a little bit in system preferences thinking I could fix it on my own, not really knowing what I was doing (I'm a *******). I went to Startup Disk in Preferences. I chose the MAC OS X, xxxx and then clicked the lock to prevent further changes and then clicked restart.
    Now when I turn on the macbook, it goes to the grey screen with the Apple logo for at least two-three minutes and then just shuts off. Won't boot into Safe Mode now. Please help. I already tried the Command-Option-P-R keys trick like five times.

    If you have a full retail DVD for 10.6 you can boot from that by holding the C key during startup...but you will then be in install mode if that is what you want to do.  At least go ahead and see if it will boot ok from the 10.6 disk and then you can decide what you want to do further.
    Apple does not have 10.5 for sale anymore from what some other users have said on here so if you want to go that route you will have to find a copy for sale such as from eBay or one of the Mac resellers.
    Before taking the machine to someone, try booting from 10.6 and see if that works...that way you can narrow down problems the machine may be having.

  • Macbook won't boot past grey screen with Apple logo and spinning wheel.

    For some reason, after about 1 year and 10 months of owning my Macbook, it decided this morning not to load past the grey screen with the Apple logo and spinning cog/wheel.
    I used it for a couple of hours beforehand, and it was working fine. Software Update prompted me of about about 4 or 5 updates; I can't remember exactly what was downloaded, but I think there was a Security Update and iTunes among them. I restarted, left it to install with no errors, but when I logged in, Safari and iTunes were running incredibly slowly. I also noticed that the volume keys weren't responding, as well as the power key to bring up the "Sleep, Restart, Shutdown, etc" dialog box. I forced shutdown, hoping a restart would solve my problem, and that's when my troubles started. I originally just left it, but after about an hour the wretched thing was still spinning.
    So far, I have done a number of troubleshooting tips on a variety of websites. I have tried taking the battery out and holding down power for 5 seconds, resetting the PRAM with option, cmd, p & r, and holding down power until the sleep light flashes rapidly and the computer lets out a large "BOOOP".
    I have booted off my Leopard install disk with both option and c, repaired the hard drive a number of times, with there being no errors whatsoever. I have tried repairing permissions, but everything seems to freeze up, except the mouse.
    For some reason my computer will not boot into safe mode, either, and holding cmd & s at startup doesn't get me to the stage where I can enter commands with the keyboard.
    Unfortunately, because of my puny 60GB hard drive, I only have 1GB of free space left and cannot reinstall Leopard without wiping my hard drive.
    I would greatly appreciate it if anyone could assist me with this unfortunate dilemma. It's such a shame that my computer has been fantastic for so long and now decides to play up. (Maybe it's just Apple trying to get me to buy a new 2.4Ghz aluminium Macbook sooner than I was planning...)
    Thanks very much.

    Hi ds,
    Sorry to hear you're having such trouble!
    Unfortunately, the best thing you can do at this point is reinstall Leopard (and then attempt to install the combo updater, too). If you don't have a backup of your machine, you could boot it into Target Disk Mode (by holding down T at startup) and then attach it via FireWire to another computer to salvage your files.
    I recently had to repair a machine with this exact same problem, and after messing around with that for several hours, I'd have to say that I think that an Erase and Install is the way to go. If you then migrate over your user data and start having troubles, you at least know where the problem lies. I suspect, though, that having a clean machine with all of the new updates applied will be the end of the issue.
    Sorry to be the bearer of bad news. There are a few other things you could try first; you could, for example, manually download the relevant combo updater from Apple's website and attempt to install it to your damaged machine while it's in Target Disk Mode. If you have a copy of Disk Warrior, that too is certainly worth a shot (and in some cases may be the saving grace). In my experience, though, a failure of this magnitude isn't easy to resolve.
    Hope that helps.
    —Hazy

  • Powerbook won;t go past grey screen with apple logo on start up

    Hi
    I am getting very stressed, my powerbook g4 won;t go past the grey screen with the apple logo when switched on. I need to sort it ideally without another computer to go through but if that is necessary then I will do it. I have tried the RAM reboot but nothing, there is not even the spinning loading symbol just a grey screen - which it will stay on until I turn it off. Someone please help!!!!!!!!!!!!! Not sure of my OS as I can't turn my comp on, but I am running leopard on it

    Welcome!
    First, see if you can boot in Safe Mode, holding the Shift key during startup until you see a message about safe mode. Getting a desktop can take longer because Safe Mode forced some disk checking.s
    ...I am running leopard on it
    Then you should have the install disks. They can be used to boot the computer for repair. Insert the DVD and press and hold the "c" key during startup. That will launch the installer BUT you don't want to reinstall yet. Find the install's Utilities menu and launch Disk Utility. From there you can check the hard drive and make some repairs.
    I need to sort it ideally without another computer to go through but if that is necessary then I will do it
    That would require that your compute work enough to start in FireWire Target Disk Mode. FWTDM lets your hard drive show up on another Mac as if it were an external drive. You can test by starting the computer and holding the "t" key until you get a blue screen with a big yellow FireWire symbol. Looks like this:
    !http://t3.gstatic.com/images?q=tbn:ANd9GcT8uGcDJDrUrECaelR5ash9yA3zuGBakhxrJ9TjfjO_uoCmKQ&t=1&usg=_5RiQv2QkO7UuPLUpiige1MVxdb0=!
    I believe FWTDM's code is in firmware and not on the hard drive , so may let yo uaccess the disk form another computer.

  • Brand new MacBook Pro doesn't get past grey screen (with spinning gear)

    Hello,
    I'm a new Apple customer - I bought a new 15" MacBook Pro during the Black Friday sale last week. Since purchase, I've installed the software I needed (Office, CS4) and have used it to browse the web and write emails.
    Today when I tried to use it, I simply got to the grey screen with the Apple logo on it and the spinning gear device underneath - got absolutely no further.
    I have done the following (running from mains adaptor - but the battery indicator is reporting 7 lights anyhow):
    1. Boot from the OSX Install Disc, and run the disc repair utility. It reported no problems found. Restarted... same problem.
    2. Boot holding down SHIFT to go into safe mode. Underneath the spinning gears, a progress bar filled up to 100% and then disappeared; leaving the grey screen, logo, and spinning gears. Nothing further.
    3. Boot holding Option, P, R as per the manual to reset the PRAM. According to the manual there should have been a chime/beep - there wasn't. It just sits on the grey screen, logo, spinning gears. Nothing further.
    Right now I've got a £1300 MacBook Pro less than a week old and it appears to have just packed up.
    Am I missing anything here, or should I just return it?
    Thanks,
    Chris

    Definitely take it back!
    My friend bought a new iMac from the Regents St. store a few weeks ago, just before the update to the new models came out, and after a week she couldn't get it to boot. I felt very embarrassed as I had persuaded to her to switch to Mac after years of PC woes, so a broken mac after a week didn't look do me any favours. The genius guys didn't mess around, they took back the dead one and gave her a new one, this time she got the new version, they also threw in iWork free as a good will gesture. New one is running fine.
    If you haven't already got Applecare, I highly recommend buying it within the next 12 months. I have needed it on a couple of occasions after the standard warranty ran out and the tech support has been brilliant, got me working again no quibbles.

  • G4 mirror can't won't boot past grey screen with dark gray apple

    Before this the computer was operating fine.
    I just went and downloaded the latest versions of itunes and Safari. It stated that I had a corrupt download of itunes. It went thru the normal downloading/install procedure. When it went to restart from the install, it just hangs up at the light grey screen with the dark gray apple and I get the spinning wheel. It stays here for one/two minutes, then shuts itself down. Any ideas for fixing? Also I do not have any install disks. Thanks.

    *Option 1*: Boot from your bootable backup drive, then erase the internal drive and clone the backup to the internal drive. You can use Disk Utility in the Utilities folder on the backup drive. Don't have a backup? Good time to start planning a backup strategy. Move on to:
    *Option 2: Download AppleJack* - VersionTracker or MacUpdate - and read the documentation carefully. Then install the utility and use it to perform repairs and maintenance on your normal startup drive. Note that to use AppleJack you must be able to startup in single-user mode. If the existing system is unable to start properly into single-user mode, then you cannot use AppleJack.
    *Option 3:* Purchase a copy of Leopard from an Apple Store or Apple retailer. Use it to reinstall OS X by doing an Archive and Install:
    How to Perform an Archive and Install
    An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
    1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
    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.) 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, then quit DU and return to the installer.
    2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
    3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
    4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
    5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
    6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

  • Computer won't load past grey screen with Apple logo, even with OS Disc

    I turn on my computer and only gets to the grey screen with the Apple logo and idling circle. After a while, it loads a small box telling me to restart, time and time again, no matter how many times I restart. I've tried holding "shift" to go into safe mode, it won't let me.
    I believe it's originally a Tiger platform, and right now I think it's running on Leopard.
    I just bought a Snow Leopard OS X Disc, and I inserted it and tried to let it load. It gave me the restart box. I held down "c" while starting up, got the restart box.
    Held down "option", and selected the "Mac OS X install Disc"; it went back to the grey Apple logo screen to load, and gave me the restart box after several minutes. Repeated that and held down "c" while loading, still gave me the box.
    Nothing I do with or without the OS X Disc is making a difference. I cannot load anything on my computer, period.
    Can someone please suggest something for me to try?

    Well if you do then turn both computers off. Connect a Firewire cable between them. Boot your computer into Target Disk Mode. After the TDM screen appears boot the other computer normally. If your drive is accessible it will show up as a disk icon on the Desktop of the other Mac. You can then access your files and transfer them to another hard drive.
    Then open Disk Utility. Your drive should appear in the sidebar list. Select the drive entry (mfgr.'s ID and drive size) then click on the Partition tab in the DU main window. Set the Partition Scheme drop down menu to one. Set the Format type drop down menu to Mac OS Extended, Journaled, then click on the Partition button and wait for the process to complete.
    Your drive should now be OK assuming it's not mechanically damaged. Eject the drive from the Desktop as you would eject any removable drive and disconnect the Firewire cable. Shutdown your computer. You can now boot from the installer disc and install OS X.

  • Can't get past grey screen with apple spinning wheel, had a loading bar for a few seconds?

    HElp, can not open my Mac. Stuck on grey screen with apple and spinning wheel?
    PReviously opened fine but I could not remember my password try a number of passwords.  I now know my password but when I turned it off and back on got this screen?

    THe command R took me to a dark scree with Mac OS X Utilities with 4 choices
    REstore From Time Machine Back Up
    REinstall Mac OS X
    GEt Help Online
    DIsk Utility
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  • My Macbook will not load past grey screen with progress bar?

    When I start up my computer the grey screen with the Apple and spinning wheel appear, then underneath a progress bar. once the progress bar is full it shuts down? Help!

    Welcome to the Apple Support Communities
    That bar appears when OS X checks your hard drive, and it's not a good sign that your Mac turns off, because the hard drive is damaged.
    Unfortunately, the only thing you can do is to take the Mac to an Apple Store or AASP to get the hard drive repaired. If you didn't make a backup, try DiskWarrior to recover data, and buy an external disk to make backups. All hard drives fail, but we don't know when they are going to fail

  • Macbook wont go past grey screen with spinning cog below...HELP!

    PLEASE, PLEASE....could someone advise urgently, was using machine ok, left it for a few mins & it went to sleep...then I couldn't log back in. Restarted and now can't get past this grey screen....have tried all recommendations...tried re install and says it can't. Tried the fsck...it say's "volume check failed". Tried the disk check...it said there was no problem. I am in Spain (Palma) and about to set off acrosss the Atlanntic to S.Maarten...my warranty expires in April and I am unlikely to be anywhere with a mac dealer or authorised service place in the next 6 months...my life is on this machine!! PLEASE HELP????

    What happens if you boot from your system install disk and run Disk Utility? Does the utility see the drive and can you verify/repair the drive?
    -Bmer
    Mac Owners Support Group - Join us @ MacOSG.com
      Mac611 Mobile Mac Support - about.Mac611.com
       iTunes:MacOSG Podcast | YouTube.MacOSG.com
                       An Apple User Group 
    Have an iPhone or iPod touch? Enter Mac611.com in Safari on it for 'mobile Mac support.'

  • IMac G5 doesn't go past grey screen with apple and spinning gear

    I have an iMac G5 (Ambient Light Sensor) running Mac OS X 10.5.2 Leopard. Last night my computer froze while using QuickTime. I had to force shutdown the computer by holding the power button for 5 seconds after everything else failed.
    Now it won't start. I hear the chime, the apple logo on grey screen appears and I see the spinning gear. But it stays like that indefinitely. I can boot with the Leopard DVD with no problem. I verified/repaired the boot disk. I verified/repaired the permissions. Everything is super fine. Made sure the selected startup disk was the correct one. I can even start up in FireWire Target Mode. I've resetted the PRAM and the SMU. Starting in single user mode also works.
    How can I solve this startup issue. Are there things I could try before resorting to a archive install or clean install of Leopard. My HD is 232GB and I have 197GB of data.
    Thanks for the help.

    I opened the back cover according to the instuctions in the manual to check the internal battery (which is fine and strong according to my little battery tester). I followed the steps in the support article "iMac G5: Troubleshooting when your computer won't turn on". According to the LED, my power supply is fine. I turned on my computer with the back cover off using the internal power button. It turned on, chimed, did the usual SuperDrive sound and did a complete boot. I took a peek at the screen by lifting a corner cause it was laying face down on a soft towel on my bed. And I saw the user prompt asking me my password, and the galaxy theme desktop picture. So I turned this off and placed the cover back on. But it still won't start using the external power button. Thanks with all your help Miriam. I'm now gonna look for a solution with the external power button issue.

  • G5 acting very strange and now will not get past grey screen with Apple log

    Hi I have had my iMac G5 for a few years and it was working perfectly up until today ! When I switched it on and it started playing up. Every application I opened would randomly shut down. For instance, Safari would crash and mail would crash, as well as the finder refreshing itself. This settled after a short while. Therefore I thought things were fine until I pressed the < or > buttons in finder and the system would refresh itself ! Weird ! Fortunately I backed up all of my iTunes.
    I can see the hard drive when I hook it up via firewire to my MacBook Pro.
    The problem I have now is that the machine will not boot up ! It gets stuck on the grey screen and after a short while the fans kick in like the thing is ready for take off !
    Any ideas ?????
    Thanking you in advance !

    Apple Discussions!
    Which model G5 iMac do you have?
    http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
    http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer
    Depending on your model, try one of the following:
    http://docs.info.apple.com/article.html?artnum=301733 (Ambient Light Sensor), iMac G5 (iSight): How to Reset the SMU
    http://docs.info.apple.com/article.html?artnum=300341 How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005)
    If the above does not work, see if you qualify for one of the following:
    iMac G5 Repair Extension Program for Video and Power Issues
    The 20-inch iMac G5 Repair Extension Program for Power Supply Issues (Rev B)
    **WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**
    If you do not qualify for any of the above programs hopefully, you have AppleCare and/or your computer is still under warranty & you should contact Apple and/or your local AASP.
    Good luck!

  • My iMac won't boot past grey screen and it didn't come with a os x disk

    My iMac won't boot past grey screen with apple. I've tried booting in safemode but that didn't help and my iMac didn't come with a os x disk.

    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 startup failure is to secure the 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 the last backup, you can skip this step.   
    There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
         a. Start up from 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, start 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. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else 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 startup 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 start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up 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 started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
    Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
    Safe mode is much slower to start 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 the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    When you start up 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, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
    If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup 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 restart as usual (i.e., not in safe mode.)
    If the startup 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 the 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 restart as usual.
    Step 9
    Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
    Step 10
    Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the 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 startup 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.

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