After my Mac from 2011 suddenly not starting only white screen apple support told me to do a usb bootable installer for OS X El Capitan. Using the installer i get prompted with el capitan can't be verified it may be damaged when downloadet. using 4 different usb memory sticks and all giving the same error code I'm convinced its nothing wrong with the download. Of course i run system diagnose and attempted to reinstall the usual way ctrl-r with no success plus the system having no faults found. I am desperate to get this boot disc working. Apple support first willing giving me the necessary command suddenly backed out and told its secret and can't be told. Go figure.
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