White screen after boot camp installation

Question

Level 1

8 points

White screen after boot camp installation

So I was installing windows 8 on my 2012 imac. all was going fine until it froze on the windows symbol. I then proceeded to restart it. Once the computer came back on, I got the white screen of death. In efforts to fix this I tried every hot key combination possible, but nothing is taking me off this screen no matter how many times I restart it. I even removed the flash drive only to get “CDBOOT: Couldn’t find BOOTMGR” I cant find any way to get my computer on. Any advice?

Posted on Nov 28, 2018 6:13 PM

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Answer 1

Loner T

Level 9

59,536 points

Nov 28, 2018 7:58 PM in response to Autumney

Shutdown the Mac using the Power button, restart and hold Alt/Option. What are the available selections?

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Answer 2

Loner T

Level 9

59,536 points

Nov 30, 2018 7:47 PM in response to Autumney

Does a SMC Reset correct the issue? Which of the two 2012 Models do you have? See Identify your iMac - Apple Support for reference.

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Answer 3

Loner T

Level 9

59,536 points

Nov 30, 2018 2:00 PM in response to Autumney

Use BC Assistant, remove the current Windows partition, and run SMC and NVRAM Reset, re-run BCA and try to install Windows.

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Answer 4

Autumney Author

Level 1

8 points

Nov 30, 2018 6:46 PM in response to Loner T

The LCD was preforming fine before this. The windows logo flashed but then turned to this shortly after. After I hit enter it switched to a black screen, which later proceeded to return to this terrifying image of orange a white. I hear it may be a weak graphics card issue, however my graphics card hasn't been known to be "weak" in anyway.

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Answer 5

Loner T

Level 9

59,536 points

Dec 1, 2018 6:39 AM in response to Autumney

Are you now able to install Windows?

The LCD screens can be very finicky. There are many known issues with the iMac LCDs. See Apple Launches Replacement Program For 27-Inch iMacs With Graphics Problems as an example.

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Answer 6

Autumney Author

Level 1

8 points

Nov 28, 2018 10:01 PM in response to Loner T

nothing happened....still the white screen.

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Answer 7

Autumney Author

Level 1

8 points

Nov 28, 2018 10:09 PM in response to Loner T

okay correction update...for some reason about 10 minutes of nothing after I did what you told me to, i was brought to a screen saying iMac or recover 10.12....

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Answer 8

Autumney Author

Level 1

8 points

Nov 30, 2018 7:54 AM in response to Loner T

Yes, however is there any way to get windows up or because this whole situation occurred did it fail.

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Answer 9

Autumney Author

Level 1

8 points

Nov 30, 2018 6:03 PM in response to Loner T

after following your instructions, my screen now has vertical orange and white stripes with a flashing line in the upper right hand corner of the screen. A little terrified at the moment...

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