If you're having problems that you can't resolve them you may need to reinstall
the Mac OS X operating system
here is how:
You must have internet access. 1- Macs running Yosemite have a built-in recovery disk that you can use to reinstall Yosemite without loosing your files and your settings. 2- Just Go to the Apple menu and select > Restart. 3- As soon as you Mac restarts hold down the Command (⌘) and R keys at the same time. 4- Then Select Reinstall OS X and then click Continue. 5- Follow the onscreen instructions, In the pane that comes up where you select a disk, select your current Mac OS X disk. Let it install when it restarts you will still have all your Files and setting with a brand new MAC OS.
Here is how it works - First you charge this rechargeable WIFI Hard drive (so it doesn't have to be plugged in) If you take a lot of Video's and picture and fill up you Iphone or Ipad you can move you video files and pics from your Iphone or Ipad to this drive wirelessly without a Mac OS x computer. Just charge this drive and leave it in your pocket and transfer you files great for travel as well. Download the free app in the apple store Add extra storage for you Iphone this way as well.
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Step by step how to create a bootable Mac OS X Yosemite Disk 2015
Step 1
Go to the app store and download OS X Yosemite again, after it downloads a window will pop up asking you to continue and install Yosemite, don't hit continue just go to the pulldown menu and quit the application.
You should now have the Install OS X Yosemite file in your applications folder
Step 2
For this step you will need:
- A USB Thumb drive with at least 8 gigs
- A root account enabled or an admin account on your Mac
Watch this video to learn how to set up a root account
https://www.youtube.com/watch?v=zHiHBDXe5JA
It is easier with a root account so go ahead and set one up.
Step 3
Erase your thumb drive and name it untitled
make sure no other drive is mounted on your computer that is also called Untitled.
If you have the root account set up
Open the Terminal and paste the codes below and hit return
only use one or the other depending on which OS you are running- Let run when it's done you will have a bootable disk.
