For me my hard drive flex cable was broken - exactly 1 day after I updated my system unfortunate accident - changed my flex cable - issue fixed. Man I'd have a hard time with accepting that its a hardware issue.
macos - OSX Prohibited symbol on Boot (High Sierra Update Caused) - Ask Different
This system has been well taken care of and been perfectly stable until now. Prohibitory symbol When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from. Melvin Jefferson Melvin Jefferson 3, 1 4 Ive used mac os recovery, it always comes back as prohibit symbol, even when everything for reinstall seems to complete correctly. I should also say that the drive is always accessible from recovery, it just won't boot from it.
Internet recovery and thumbdrive show success, but still doesn't boot.. Also hardware diag shows good, and again I can browse the drive in terminal with recovery boot Aaron Aaron 11 1. I have also tried: Canon ParagonSnapshot. Paragon VDMounter.
Paragon LittleSnitch. As a work-around, these are the steps I took to solve the problem: Dean Wolf Dean Wolf 21 1. Update to follow This is not an uncommon problem. Sign up or log in Sign up using Google.
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Circle with a slash on startup
An 09 might just be borderline. I tried it, it wont detect the disk. You think this will work?
You'll still need to boot up to an install disk to restore from Time Machine, if I'm not mistaken. I'm assuming you don't have the OS recovery partition since that will both enable you to re-install the OS and restore from a Time Machine backup I think; I've deleted my partition to recover the space. Sign up or log in Sign up using Google.
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- What is the symbol of a circle with a slash through it, white on black screen? | Mac Forums.
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Its background can be black, gray, blue, or a desktop picture. If an image doesn't appear after a few moments, make sure that your display is turned on, connected, and has its brightness turned up.
Blank (empty) screen
Your Mac displays an Apple logo when it finds a local startup disk, which is a startup disk built into or connected to your Mac. If it can't find one, it looks for one on your network. When using a network startup disk, your Mac displays a spinning globe instead of an Apple logo. Learn how to resolve a flashing question mark. Enter the firmware password to continue.