Mac boot from usb stop sign

I think this is what the prohibited sign is saying: I might be wrong, but this is currently my working assumption.

Now I just have to figure out how to fix the USB port limit issue. In addition to everything below, I've tried the following: I see a few options and will try them out, so would appreciate any guidance. It doesn't seem like the cause of my issue is the same as what is listed. I'm running the following successfully in I've tried booting with everything unplugged except: I've tried booting with all of my peripherals connected.

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No change. When booting normally, the boot eventually stops at the prohibited sign. When booting verbose, the prohibited sign appears and most of the text on the screen becomes garbled. At this point, I suspect there's a graphics card incompatibility. If so, how were you able to get the system to fully boot? Appreciate any help. Already have spent days trying to figure this out.

I hope I won't need to buy another video card..

Resolve boot issues showing 'prohibitory' sign

The installer loses connection to your USB stick, which is why it ends with "Still waiting for root device" and throws the prohibited sign. The root device is your USB installer.

Has nothing to do with graphics cards. How do you fix this? I don't know.

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I've partially fixed the problem by following advice in this thread. From there I was able to install and get running. Next up, I'll need to see about modifying the kext to get all of my ports running correctly - that will be a separate project when I have time Finally decided to completely wipe my boot drive and start over. Now everything seems to be working, except I'm unable to login to the App store to download any of my apps. At least I'm able to boot up now. Got past the booting issue.

Fixed the USB issues following this guide: Either settings between the software and computer hardware are not in agreement, or there is a missing critical component to the OS X installation.

The people who are most prone to this error are those who use multiple bootable installations of OS X. When booted in one, you have full access to the file system of the OS X installation, which may lead to inadvertent modification of important files many of which are usually hidden from view. Depending on the specific problem, you may be able to help the issue; however, if the system files have been modified, you will probably have to reinstall your system.

no entry sign on OS reinstall

Hold the Options-Command-P-R keys immediately after pressing the power button and the system will continually reset and make the boot chimes while they are held down. Let it cycle a few times and then release the keys and hope the system boots.

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If you have access to another Mac, and both it and your current one have FireWire capability, connect them and reboot your current system with the "T" key held down. This will put it in Target Disk mode and it should appear on the second Mac's desktop. Note, if your second Mac's hard drive is named the same as the mounted FireWire hard drive, rename the FireWire hard drive to something else, such as "Macintosh HD2". After this command has been completed, eject the FireWire disk from the system and press the power key on the affected computer to turn it off.

When you power it back on, hopefully it will boot normally again. If you have a Time Machine backup, restore a working version of your system with that.

Unable to boot from usb with 'stop' sign - Apple Community

However, if you reinstall OS X, be sure to perform an "Archive and Install" OS X Snow Leopard automatically does this unless the drive is erased to preserve user settings and installed applications. Post them below or email us! Mobile World Congress Complete coverage from the world's biggest phone show.