SOLVED.
Had this problem myself with hanging on the USB load during install. I didn't even consider that it was my GFX card that was the problem (an older 750 TI, had no issues with it on el capitan).
I solved the problem by removing the card and using the motherboard GPU. Took only about 5...
Updated from the app store as normal, absolutely no problems. Graphics and sound all worked without trouble.
Of course I backed up via Time Machine and saved the newer NVIDEA drivers and the new El Capitan update to my thumb drive just in case.
My gear: 560Ti, ASrock Z97X mobo (not even...
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