Update to El Capitan: does not start

I did a clean install of El Capitan on my MacBook Air and transferred all my apps, files, settings etc. of Time Machine. After some initial difficulties to obtain the user account to work (I've done something in users and groups, but can not remember what exactly), all executed perfectly. I closed, come to the office and restarted, only to be confronted with a blue screen and nothing else. I was in Disk Utility first aid and everything seems in good condition it. I am at a loss. Can anyone help?

Try a boot sure try safe mode if your Mac does not end commissioning - Apple Support

And see OS X Yosemite: If you see a blue screen at startup

Tags: Mac OS & System Software

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