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Creating El Capitan USB installer but desktop goes black, computer freezes


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Serious problem here. 


Trying to create El Capitan USB installer for Dell e6230, following Herve's guide with Enoch. Though the first part is the same as Jake Lo's guide with Clover. 


It's now 4 different times that I had this problem, working on my 2009 Macbook Pro with El Capitan, where the desktop goes black and then the computer freezes, and I have to force restart.

- first time, mounting BaseSystem.dmg

- the other 3 times, when copying Packages to the USB drive


I've redownloaded the El Capitan install app, in case it had been corrupted. 

I've tried different USB drives. 



I've never had this problem with other times to create a USB installer, but if I remember maybe that was creating installers for Yosemite and Mavericks. I have created El Capitan installers, but I don't remember if it was on this Mac, a 2009 Macbook Pro running El Capitan. 



P.S. in my sig I have an e6230 with El Capitan, so obviously I succeeded before to install it. I don't have that USB pen anymore though. Strange. Unless I created that first USB on a different Mac.

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