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how to boot from old operating system

563 Views 4 Replies Latest reply: May 4, 2012 11:04 AM by ds store RSS
MerajHoda Calculating status...
Currently Being Moderated
May 4, 2012 5:00 AM

Hi,

 

I have downloaded Lion OS 10.7.XX trhough App Store. When I tried re installing the OS it failed after the bootup due to the  Hard drive error.

 

Now it is recommending me to format the Harddrive then re install the OS. I'd like to go back to my previous us so that I back up my data prior to formatting the hard drive.

 

Can some one help me out with this.

 

How can I boot from my previos operating system that was installed on the device

 

Appreciate and immediate help.

 

Thanks,

 

Mohammad

MacBook Pro, Mac OS X (10.7.3)
  • petermac87 Level 5 Level 5 (4,065 points)
    Currently Being Moderated
    May 4, 2012 5:14 AM (in response to MerajHoda)

    MerajHoda wrote:

     

    Hi,

     

    I have downloaded Lion OS 10.7.XX trhough App Store. When I tried re installing the OS it failed after the bootup due to the  Hard drive error.

     

    Now it is recommending me to format the Harddrive then re install the OS. I'd like to go back to my previous us so that I back up my data prior to formatting the hard drive.

     

    Can some one help me out with this.

     

    How can I boot from my previos operating system that was installed on the device

     

    Appreciate and immediate help.

     

    Thanks,

     

    Mohammad

    If you have a hard drive error then changing back from Lion will not help the issue, What problems are you having and what is it telling you that you have a hard drive error? You do have a full Time Machine backup or clone of your old system as it was before upgrading to Lion? Or a current Backup and yourSnow Leopard or previous system Install discs?

     

    Pete

     

    Pete

  • Shootist007 Level 6 Level 6 (16,640 points)
    Currently Being Moderated
    May 4, 2012 7:54 AM (in response to MerajHoda)

    I think, but I'm not sure, you may have to hold down the Option key at boot then select the drive that has your old OS.

     

    But that may not be an option as the Lion install routine kind of takes control of the boot routine bootiing into the actual install program.

     

    It's worth a shot so give that a try. If that doesn't work the only other option may be to boot off the original OS X install DVD that came with your system and try to reinstall that OS over the top of the current install.

  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    May 4, 2012 11:04 AM (in response to MerajHoda)

    If the 10.6 TimeMachine drive was never connected to the 10.7 altered Mac, then DON'T connect it.

     

    Simply manually drag and drop backup your new 10.7 files to a external drive and disconnect all drives.

     

    Hold c boot off the 10.6 disk and use Disk Utiity  to erase the ENTIRE internal drive, then restore from the 10.6 TimeMachine drive, return any recent files from 10.7 from the storage drive.

     

    How to revert your Mac to Snow Leopard

     

     

    Lion alters things, like the partition map, the Users/Library folder etc., only by erasing the entire drive can you rid yourself of it's filth and return to the blessed and fast Snow Kitty.

     

    You can't use a 10.7 altered TM drive to restore a user to 10.6 with, it doesn't work. SO if your TM drive has been altered by 10.7, then you have to do a manual reinstall of 10.6 + programs + just all files as outlined in the link above.

     

    If you learn to make bootable clones, then your a lot safer, have more options and can run the computer off the clone drive.

     

    Most commonly used backup methods explained

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