Your Yosemite installation is defective. Drag these applications to the Trash and reinstall Yosemite.
If you’re having problems with a disk, Disk Utility can check the disk and repair problems it detects. How to repair a disk To browse the Disk Utility User Guide, click Table of Contents at the top of the page. In Disk Utility select your Mac's internal drive, making sure to click on the drive and not the volume beneath it. You should see two tabs below the toolbar: First Aid and Partition. Click Partition. To access the Disk Utility on a modern Mac—regardless of whether it even has an operating system installed—reboot or boot up the Mac and hold Command+R as it boots. It’ll boot into Recovery Mode, and you can click Disk Utility to open it up. In Recovery Mode, macOS runs a special sort of recovery environment. The macOS Disk Utility, by default, will not show you an empty, unformatted drive. You might think this means it can’t be used to create partitions on new disks, which is frustrating, but you can solve this problem with one click.
Reinstalling OS X Without Erasing the Drive Samsung sync manager for mac.
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Reinstalling OS X Without Erasing the Drive
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
Run office repair on mac.
When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Alternatively, see:
Minecraft multiplayer lan mac. Reinstall OS X Without Erasing the Drive
Where Is Disk Utility On My Macbook Air
Choose the version you have installed now:
Mac Disk Utility Startup
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it isthree times faster than wireless.
Where Is Disk Utility On My Mac
Mar 30, 2015 1:41 PM