Re: mac os sierra clean install and a few questions
Hello,
Before doing a clean install, make sure you have anything important from your OS X partition backed up. This mainly has to deal with files that you can't get back like important documents and other user created data that is valuable to you. Don't bother backing up programs or the system since those things can be downloaded from the internet. The best way to get a copy of Sierra is to simply download it from the Mac App Store. When that's done, you may want to create an install disk using an application like install disk creator. Make sure you have a blank USB drive or SD card that you can use for the installer. What you want to do next is to open install disk creator and choose your Sierra application from the applications folder. It should find and select it automatically for you. Next, choose your USB Drive or SD card to copy the install files to. This needs to be at least 8 GB since the installer averages around 5 or 6 GB. When the program is done cr eating the disk, try rebooting and holding the option key to select the newly created disk. I'm not sure why pressing and holding option no longer works for you. Have you used someone with sight to verify that it doesn't work as expected? The only thing I can think of to resolve this would be to check for updates to your Mac firmware in the App Store.
Once you've booted into the new installer, choose disk utility from the Utilities list and format the Macintosh HD Partition as Mac OS Extended Journaled. Once that's done, press command q and choose install Mac OS and follow the prompts. From that point, you should be fine. Just remember not to touch the BootCamp partition. As long as you leave that one alone, your Windows installation should remain intact. When you're done, you will have to set up the computer as a new computer and download/configure all your programs again.
As for the USB devices question, I think that is because the computer is trying to boot from the device but not finding anything. I hope this has helped you.
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