Help... cannot start the iMac...

More old iMac 21 "Yosemite running and have never had problems before and not real techy so need someone to guide me to get this machine running. I was online earlier, and all of a sudden my computer froze. Could not move at all. Pressed the button the back of the computer to restart. Gray Apple logo comes up and bar gets about 1/2 way thru (not quite 1/2) and it just sits there and never moves. The startup disk restart and tried to fix and get the system files check or repair failed in red. Something also shows invalid Mode Structures Volume... anyone have any ideas on how I can get it started and rerun? Really don't want to have to reinstall... There is a library I have not backed up a little and have worked on it a little... Thanks for any help!

First of all, try this:

Repair the hard drive and permissions - Yosemite, Mavericks, Cougar or Lion

HD recovery start

Restart the computer and after the chime hold the Command and R keys until the Menu Utility is displayed.

Repair

When the Utility Menu appears, select disk utility and click on the continue button. Disk utility charges and select layouts withdrawal (usually Macintosh HD) the list entry side.  Click the first aid tab, and then click the repair disk button. If disk utility reports any errors that have been corrected, then again run repair disc until no errors are reported. If no errors are reported, click repair permissions . Wait for the process to finish, and then quit disk utility and re-enter the Utility Menu. Select restart from the Apple menu.

If you continue to make the same mistake, then you can spend $99.00 for the purchase of Disk Warrior, a utility that can fix this error. Or, you can clear the OS X volume and reinstall OS x as far as I know those are your only options assuming that the disk is not fault. To erase and start again to do the following:

Install Yosemite or El Capitan, from scratch

Backup if possible before proceeding.

  1. Restart the computer. Immediately after the chime hold down the command and R buttons until the Apple logo appears. When the Utility Menu appears:
  2. Select utility disc in the Menu Utility, then click the continue button.
  3. When loading disk utility, select the volume (entered into withdrawal, usually Macintosh HD) from the list of devices.
  4. Click Delete in the main window of disk utility. A panel will fall.
  5. Define the type of Format Mac OS extended (journaled).
  6. Click on the apply button, then wait for the done button to activate and click on it.
  7. Quit disk utility and re-enter the Utility Menu.
  8. Select reinstall OS X and click on the continue button.

Tags: Mac

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