Something is wrong! Start in safe mode, but it turns out that for Normal mode.

Mac Mini (late 2014)

Processor 3 GHz Intel Core i7

16GB 1600 MHz DDR3 memory

Start drive Macintosh HD

Iris 1536 MB Intel graphics card

Monitor: DELL U2713HM, use the Apple adapter to connect to the Mac Mini

I upgraded from Capitan in Sierra and got the problem that after I pressed the power button, the screen is full white. This problem has occurred on the Sierra, never happened in Capitan.

I went to the Apple store today, they made a few diagnostic and found no problem. Everything is good. System is fine too. In the Apple store, they showed me to press SHIFT after I press the power button and it will start up the Mac in safe mode. They told me this can sometimes help fixing the boot issue. My Mac actually works very well in the Apple store. I tried the power and turned off twice in the store, and there is no problem. I am happy and come home.

After I go home, I turn on my Mac, it always has the same problem before you go to the Apple store, after I pressed the power button, the screen is completely blank. So I tried to boot mode safe by pressing Shift and taking until I saw the Apple logo on the screen.

After I log in, I checked my Mac mode, this is actually Normal mode!

If I intended to power to the top of my Mac in safe mode but it turns out to be normal.

If I do not press SHIFT and hold it pressed down after I turn on the power, I'll have just a white screen!

It works very well in Apple store, but not in my own House.

Anyone know what is happening?

What is different between your system and the store? Have you taken your own keyboard & they were they that? If you use a bluetooth keyboard try using a wired USB one instead. Is this an original Apple keyboard?

Do you have other devices connected? If you delete them.

Please see the article below from Apple, it has information about starting in safe mode without keyboard (by setting a NVRAM variable). If you enter a work boot, you can put the mini in safe mode from there, via the command appears on this page...

Try safe mode if your Mac does not end commissioning - Apple Support

I would like to start trying to make another bootable OS disc - either an installation disc or a complete operating system to see if the Mac can be started OK to a different installation of OS - which indicates if the operating system or disk are part of your question, or if the material is simply unable to work correctly at all.

Tags: Mac OS & System Software

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