Jan 21, 2016 Super Simple Hackintosh Install 2018. Fixit How to boot mac os x into safe boot or safe mode. FIX BRICKED Prohibitory SIGN ISSUE on MAC. Tonymacx86.com: Home of the CustoMac Buyer's Guide, iBoot, MultiBeast, UniBeast, and the world's most helpful #hackintosh #mac #osx. Jan 29, 2010 Computers Resolve boot issues showing 'prohibitory' sign. Mac OS X has several bootup symbols, including a universal 'prohibitory' sign.
![Prohibitory Prohibitory](https://tr1.cbsistatic.com/hub/i/2015/05/07/b5d9e8ef-f490-11e4-940f-14feb5cc3d2a/04022013figure-b.png)
Premiere pro motion blur. [RESOLVED] Prohibitory sign when booting from install USB Hi everyone, I have a fully functioning Mavericks installation running right now. My build is such that I don't even need to run Multibeast when I do a fresh install - I just need to use the iBoot USB to boot, and I use an external USB sound card. In other words, up till now, I've had no hardware that causes any big issues with OS X.
Macbook Pro Prohibitory Sign
![Prohibitory symbol on mac Prohibitory symbol on mac](http://i39.photobucket.com/albums/e184/eseverino/IMG_0004-1.jpg)
I followed Tony's guide to upgrade to Yosemite directly from Mavericks here:, creating an install USB. However, when I try to boot into the installer from my new USB, after a few minutes of loading (maybe at about 30%) the screen goes fully gray and I get a prohibitory sign. The installation halts completely. Since all of my hardware has seemed very OS X-friendly so far, I can't begin to imagine what the problem is. You can see the details of my build on my profile, but I'm pasting here as well: Motherboard Gigabyte GA-Z77-D3H CPU Intel Core i5-3570K OC'd to 4.08 GHz Graphics MSI R7870-2GD5T/OC (2GB) Other Hardware 2x4GB G.SKILL Ripjaws X @ 1600 MHz 2x2GB Micron @ 1333 MHz Sound Blaster X-Fi Fatal1ty 250GB Samsung 840 (Win8) 250GB WD @ 7200 (Win7) 160GB WD @ 7200 (Mavericks) 500GB Seagate @ 7200 (Storage) I'd appreciate any help you guys can give me.
Mac Os X Install Prohibitory Sign
![Macbook Macbook](https://omghowto.com/images/mac_os_x/font/install_font_on_mac3.jpg)
Please tell me if any other information would be helpful. UPDATE: So I'm currently posting this from inside Yosemite! MASSIVE ups to Fjordn for asking me to make sure I was using a USB 2.0 port instead of a USB 3.0 port. I moved the OS X Installer USB to a USB 2.0 port on the back of my motherboard, instead of my USB 3.0 ports on the front of my case, and on the first try everything worked as smooth as butter. Not a single boot flag or hardware change. So folks, when you're installing, DON'T TRY TO USE A USB 3.0 PORT. I'm tying to remember what i did exactly since i did the upgrade a couple of days a go and I ran into so many problems.
I believe I always boot using the motherboard boot option to avoid that 'mach_kernel' error. After the upgrade was successful I still have to boot from the usb one more time using the boot option. After the boot option display I chose the bootable usb then i choose to boot from my SSD with the option -x -v -f. I actually have to disconnect all of my monitors from the graphic card and only connected one monitor directly to the motherboard. I hope this help. What do you mean by 'motherboard boot option'?
Do you mean just specifically telling the computer to boot off the USB, or is that some sort of boot flag? Also, what you said about the graphics reminded me of something. I now remember that having an AMD 7000 series card causes some problems with boot, so maybe it's best to swap in my VGA monitor directly connected to the motherboard just for install. I'm just wondering, though, has anyone else specifically experienced the prohibitory sign ('No' symbol, if you prefer) during a Yosemite upgrade?
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![Macbook air prohibitory sign Macbook air prohibitory sign](http://cdn.osxdaily.com/wp-content/uploads/2016/02/re-install-os-x-recovery-mac-6-610x527.jpg)
Was anyone able to resolve theirs?