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I have formatted my iMac late 2013 with ubuntu 14.10 but it ain't booting up ubuntu . Now i am wanting to get back to OS X . Is there any way to create a bootable stick in a windows PC and reinstall OS X ?
iMac, OS X Yosemite (10.10.3)
There is no need to create a bootable stick when Apple includes re-installation tools built in.
When booting the system hold down the OPTION key, this will bring up a list of your Partitons on your iMac's HDD, choose the disk icon with Macintosh HD/whatever you called it and it will boot into OSX.
From there go to System Preferences-->Startup Disk-->Choose the disk that holds OSX
If this doesn't work you may need to re-install the OS using OSX Recovery, hold down the Command and R keys at startup to trigger this menu.
Choose "Re-Install OSX" you need to be connected to a Wi-Fi Network/Ethernet Network.
See if this helps🙂
Actually i have formatted the Macintosh HD in ext4 format so the BIOS is no longer recognizing the HDD so nothing is shown 😟
So holding at Command+R at startup doesn't trigger Recovery Mode?? Try this and if not, proceed with the next step-Internet Recovery
Internet Recovery is identical to Recovery Mode, however it downloads a fresh copy of it from Apple's Servers, in the case your OS is damaged/corrupted that it cannot initiate the local version of Recovery Mode (such as what has happened to yours).
Hold down Command+Option+R to initiate this--make sure you are connected to a network.
Then choose to "Re-Install OSX" as i mentioned earlier.
Look at this document if you are still stuck-OS X: About OS X Recovery - Apple Support
🙂
Installing OS X
