[Solved] El Captain Prohibited Sign and Garbled text

[macthemall]

Update: It worked, you can continue reading for your info

Good day everyone

I don't want to waste your time with a long introduction so lets start


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My PC specs:

- Motherboard: MSI Z170A Gaming M5
- CPU: Intel Core i7-6700k
- Graphics Card: Nvidia GTX 970
- RAM: 16GB

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So i have created El Captain USB Installation using Unibeast 6.2.0
and at the start it was hanging on the apple logo screen and the progress bar isn't moving even if
i use the following boot flags:

nv_disable=1, cpus=1, -v

What i have done is to following the installation guide, and i was able to get some progress by
changing BIOS settings to:

XMCI Hand-Off = Enable
Super IO Confiuration = Disable
Storage Boot Option Control = UEFI Only
Boot Option #1 = USB Stick

After doing this i was able to get the progress bar to move beyond the half distance
BUT then it stops and shows Prohibited Sign with Garbled text


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Here is some pictures:

1) It stops here for 10 seconds where it says: "AppleUSBHostPort::resetGated: retrying enumeration in 100 ms"

2) Then it stops here for 5 Seconds where it says: "Missing Bluetooth Controller"

3) Here it stops almost for 5-8 seconds where it says: "usbmsc identifier (non-unique) 4C530001220120117051 0x701 0x5567 0x100, 2"

4) Then it jumps to Prohibited Sign and Garbled text

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Other ways that i have tried but no luck:

- Unplugged all devices from all USB Ports
- Tried both USB2 and USB3
- I have tried different SATA Ports
- I have removed all HDDs except the one that i want to install El Captain to it
- Tried the flag -x for safe mode in addition to nv_disable=1, cpus=1, -v but it didn't work
- Tried also the flags npci=0x2000, USBBusFix=Yes in addtion to nv_disable=1, cpus=1, -v

Actually it won't boot until i mainly use these flags nv_disable=1, cpus=1


Please HELP,

Thanks a lot for your time.

 

[macthemall]

I found this thread:
https://www.tonymacx86.com/threads/...-msi-z170a-gaming-m5-i7-6700k-gtx-970.198297/

I will try to follow the guide and if it works i will keep you informed

 

[macthemall]

Yeah!
Finally i got it working and i only needed to use the flag nv_disable=1

How it worked?

i have followed the guide which is the one in the above comment and it didn't work until i have done the following:

- My motherboard was on bios version 1.A, i have downgraded it to 1.9
- It only worked when i used El Captain 10.11.6 (i used 10.11 and it didn't work)
- Only one USB port worked!!! Which is the one to the right of the bottom of the Motherboard MSI Z170A Gaming M5

Just a note: some people say that some kinds of keyboards and mouses my cause Prohibited Sign,
i'm not sure about this, but in my case i have Razer Taipan mouse and Razer Blackwidow Chroma keyboard
and they worked without any issue, i have also tested a cheap keyboard and mouse and they also
worked.

As you can see it is a headache, you have to use the exact pattern of the guide
so if use other version of bios it won't work, if you use different version# of the OSX it won't work
and of course you have to find which port of your motherboard would work.

Now i have a CustoMac(iMac7) that would cost me around 4000$ if it was a real one

I am really thankful for Tonymacx86 for making this happens with their incredible tools

Also a special thanks to
julian200601 for his guide:

https://www.tonymacx86.com/threads/...-msi-z170a-gaming-m5-i7-6700k-gtx-970.198297/


Have a great CustoMac!