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I have an imac that won't boot. I get an error message that it can't find a particular driver.

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  • Steve Caulfield Jul 03, 2010

    I have tried what the previous expert suggested,I reset the pram and booted using command and s and got the line-command screen.The line command or single user screen isn't accepting typed in commands-it keeps repeating waiting for root device over and over after the error message of unable to load extension for a driver. This imac isn't booting from the hardrive and I've already reinstalled the OS (Tiger 4) I replaced the pram battery, but I don't know if I got it in correctly.

  • Steve Caulfield Jul 04, 2010

    I recently replaced my Pram battery.It's a 1/2AA battery on the motherboard. I'm not sure if I put the new one in correctly. The positive and negative terminals aren't marked well on the motherboard. Could this be contributing to my inability to get the unix screen to accept commands?

  • Steve Caulfield Jul 04, 2010

    Yes-though I lost the original cds, I'll see if I can find others,thanks


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The iMac comes with two CDs that allow you to reinstall system software, the iMac System Software CD and the iMac Restore CD. Each CD is bootable.

iMac System Software CD - This CD contains installation files that will reinstall the iMac version of the Mac OS. To reinstall the system software, use the Installer application and follow the standard Mac OS 8.1 installer procedures. Installers for utilities and bundled applications are also present on this CD.

iMac Restore CD - The Restore CD contains an image of the iMac hard disk as it was shipped to you. A utility called Apple Software Restore allows you to restore the hard disk to that configuration. The Restore utility has a number of options to control formatting of the hard disk or saving of data and applications before using the Restore utility. Read the Restoring iMac Software text file to understand how to prevent accidental data loss.

To restore the iMac hard disk
If your computer came with both Mac OS 9.1 and Mac OS X installed on the hard disk, you should follow the restore procedure outlined in Article 60847 "Apple Software Restore: How to Perform a Multiple Disc Restoration"

Start the system with the Restore CD in the CD drive while pressing and holding down the C key. This action causes the computer to boot from the software on the CD-ROM instead of the hard disk. You will see that the CD icon in the Finder is then located above the hard disk icon on the desktop. Double-click on the CD icon and double click on the Apple Software Restore icon. After launching Apple Software Restore, you should see the following splash screen. Click the OK button to continue.

Apple Software Restore Options

Restore in Place
Click the Restore button to restore the configuration "Mac Restore CD" onto "Macintosh HD," Overlapping files on "Macintosh HD" will be replaced by the corresponding files in "Mac OS.img."

Erase Macintosh HD before restoring
Click the Restore button to restore the configuration "Mac Restore CD" onto "Macintosh HD," using Macintosh Extended volume format. "Macintosh HD" will be usable as a startup volume only on PowerPC computers. The contents of "Macintosh HD" will be erased before restoring

Default setting: If neither Restore in Place or Erase "Macintosh HD" is checked, you can use the Volume Format menu to choose Standard or Extended format. You will see this information in the "Descriptions" window:

Click the Restore button to restore the configuration "Mac Restore CD" onto "Macintosh HD," The existing contents of "Macintosh HD," will be moved to a folder named "Original Items."

The iMac Restore CD also contains a utilities folder that allows you to perform checks on the hard disk. The utilities folder contains a set of standard Apple troubleshooting tools and utilities.

Finally, there is a folder on the Restore CD called Configurations. This folder contains a disk image file which includes all the iMac's software that the Apple Software Restore utility copies to the hard disk during restoration.


Posted on Jul 04, 2010

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Hi! Please try this. Unplug the pc from power source and let it sit for atleast 30mins. this should reset the system and can get rid of the problem. Plug the pc again to power source, turn on the pc and see how it goes. Please get back to me on the progress. Hope this helps and have a good one!

Posted on Jul 04, 2010

  • Steve Caulfield Jul 04, 2010

    Hello-I have already done that as well-When I plug it back in it's the same problem.

  • dj_relly999
    dj_relly999 Jul 04, 2010

    Not really. You did just fine and no need to worry on the battery.


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Could you please provide me with the exact error message. Without that, it would be tough to diagnose the fault.


Posted on Jul 03, 2010

  • 4 more comments 
  • Steve Caulfield Jul 03, 2010

    When I booted in single user mode the message was-failed to load extension AppleMacRiscPC Iand then-still wating for root device.

  • Steve Caulfield Jul 03, 2010

    If I boot in normal mode there is no error message- I get the grey screen with the Apple icon and that's all that happens.

  • taran_2005
    taran_2005 Jul 03, 2010

    Thanks for your response!!

    That's because the Mac OS's system files are damaged, so the only way to solve the issue is Archive and Install. Since this is software issue, it can be easily solved by the Mac OS X installation disks.

    However, we can try some other troubleshooting steps and see if they can solve the problem.

    Reset PRAM and NVRAM

    1. Shut down your iMac
    2. Locate the following keys on the keyboard
    : Command, Option, P, and R.
    3. Turn on the computer.
    4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
    5. Hold the keys down until the computer restarts and you hear the startup sound for three times.
    6. Release the keys.

    Run DiskUtility

    Restart your Mac and hold down the Command (APPLE) key and the S keys at the same time. You can see a unix text screen and if you are able to type, then type this :

    Type in the following command EXACTLY:

    /sbin/fsck -fy (note the space between fsck and -fy)

    Hit return and the disk utility should run. Let it finish. If it returns any errors, then run the command again. When it finishes, type reboot and hit return Let the Mac boot up and see if it is still giving you problems.

    If the above solutions doesn't solved the problem, then you need to Re-Install your Mac OS. You can do a Archive and Install. Archive and Install will not remove any of your files,applications, settings etc. It just replaces the system core files with new one.To do an Archive and Install, you need buy the same installation disks for your Mac.

    More about archive and install :-

    Let me know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!

  • Steve Caulfield Jul 03, 2010

    I got it booted to the command line screen-right now it won't accept a typed command-it's still wating for the root device- will it eventually accept a command? I have already reinstalled the OS and that doesn't seem to solve the problem. The install DVD was verified before the install.

  • Steve Caulfield Jul 03, 2010

    It keeps repeating the line-still waiting for the root device. It's repeated it 10 times so far. Could a bad install DVD cause a problem?

  • Steve Caulfield Jul 03, 2010

    I also replaced the system battery- but I'm not sure I have it in correctly-as far as polarity.


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