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Hi, I have a problem with booting my iMAC 5k (late 2015, i7, 27") when using Sonnet lll + GTX 970. After clean install of 10.11.3 el capitan I disable System Integrity Protection, download newest CUDA, plug in my Sonnet lll with GTX 970 installed and run automate-e-GPU (https://github.com/goalque/automate-eGPU ). I activate -a mode of the script and restart. First restart works fine, GTX 970 works but after another restart my imac gets stuck while booting with black screen. I know thats a common issue with eGPU but I tried all fixes I found, nothing helps. One thing that works is the power up process described here (https://www.techinferno.com/index.php?/articles/guides/2015-13-macbook-pro-gtx97016gbps-tb2akitio-thunder2-win81osx1010-tranj10-r2/) ----------------------------------------- Power up process: This is the power up process I always use to consistently have a successful boot without any black screen issues. 1) Have everything powered off 2) Connect thunderbolt cable to eGPU and MacBook 3) Power on the eGPU power supply (use a power strip with on/off switch) 4) Wait ~15 seconds 5) Power on the MacBook while holding option key 6a) Select the boot partition you want 6b) If you run into a blank black screen: - Force power off for MacBook - Power off eGPU power supply - Disconnect thunderbolt cable from MacBook - Power on the MacBook while holding option key - Boot into OS X, log in, and shut down - Go back to step 1 (there will be no black screen issues for at least the next boot up) - If you still are getting black screens after repeated tries then try a NVRAM clear (https://support.apple.com/en-us/HT204063) - Note that the NVRAM clear does mess with the changes implemneted by automate-eGPU. So you'll need to run 'sudo ~/Desktop/automate-eGPU.sh -skipdriver' to re-enable the changes - If the NVRAM clear doesn't help then try enabling -a mode with automate-eGPU by running 'sudo ~/Desktop/automate-eGPU.sh -a' ----------------------------------------- That process works one time but I dont want do do that whole process every time i start my imac Tried the NVRAM clear and automate mode of the script restart- stuck in black screen Also tried to make a backup of AppleGraphicControl.kext and replacing the backup after running the script, imac wont boot at all even without eGPU plugged in. When i boot without eGPU - no problem, when i plug in the TB connection after I booted, the GTX 970 is called Nvidia Chip Model, so that dont works neither. I just need the eGPU for CUDA, no video output from the GTX970 is needed. Can anyone help me? I would donate some cash for a working solution. Best Regards, Proph

Hi, I have a big/little problem to make my eGPU work. Here's are my specs and hardware. Macbook Pro 15" Mid 2012 2.6GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache 8GB of 1600MHz DDR3 memory 1TB Seagate SSHD + 750GB 5400 rpm (optical disc drive removed) NVIDIA GeForce GT 650M with 1GB of GDDR5 memory OS: OSX Yosemite & Bootcamp (Windows 8.1 64-bit) eGPU needed hardware/software: 480W PSU Veriton Sonnet EE PE4C-EC060A v3.0 (Link to website: http://www.hwtools.net/Adapter/PE4C%20V3.0.html ) QLeadtek GTX 650 Ti Boost DIY eGPU Setup 1.20 by Tech Inferno Fan So, I already have bootcamp(Windows 8.1) installed. So skip that part. Installed the DIY eGPU 1.20 (Have read throught MBR implementation, it seems my model requires 1.20 since everyone is using it?) Hook up the hardware. Image below shown. Ok. I cant upload a 189kb picture. This sucks. I hooked up the 24 pin from PSU to the eGPU. And use a 2 molex adapter to a 8 pin connector to power my GPU. Then eGPU express card to my Sonnet and to my laptop. Situation: eGPU and GPU works when I on my laptop. That's fine. Problem 1: Whenever I do that in the beginning, my computer freezes. Before my mac can boot up to windows os, it freezes on the white screen. Problem 2: Run laptop first to boot windows 8.1. Then plug in eGPU. GPU isnt detected. Nothing happened. So far this is accurate on what I have been doing with eGPU. I worked on this for more than half a year now. I need help. I've gone through lots of websites and such. But havent gone through enough. Please let me know what's my problem or any further information, i'll do my best to answer them. (Edit1: Planning to buy a swex soon. So its gonna take 1 month time. Not sure if its needed or not) Thanks, Kazeki