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I'm installing Sierra. Loading fine.. apple symbol on the screen.. than right when It switches to finally go the actual install..(user input) the screen goes black

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by pushing whatever function keys normaly brighten your display? or am i misunderstanding your issue.

Tried... not the brightness...    grrrr.....

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Hello I have a problem, start with the usb passing apple logo, suddenly turn off the screen brightness

Im having the same problem....  driving me nuts trying to figure this out.

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Anybody had issues with iMessage and Facetime working?  I changed my Lan and wifi to En0 and En1.   still won't work properly...  am I forgetting something?   

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So getting this KP..  every so often.

 

*** Panic Report ***

panic(cpu 0 caller 0xffffff800133e530): "a freed zone element has been modified in zone kalloc.256: expected 0xdb989fd3af32e7c4 but found 0xffffff8001b22d60, bits changed 0x24676053ae80caa4, at offset 0 of 256 in element 0xffffff8016ca2400, cookies 0x3f00113532788c48 0x535213c719f592b"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3789.41.3/osfmk/kern/zalloc.c:651
Backtrace (CPU 0), Frame : Return Address
0xffffff801135b6e0 : 0xffffff80012f210c 
0xffffff801135b760 : 0xffffff800133e530 
0xffffff801135b7d0 : 0xffffff800133d6a9 
0xffffff801135b820 : 0xffffff800133c0e4 
0xffffff801135b970 : 0xffffff80018390d7 
0xffffff801135b9a0 : 0xffffff80018c5134 
0xffffff801135b9e0 : 0xffffff7f825a9117 
0xffffff801135ba40 : 0xffffff7f825a6d4e 
0xffffff801135ba70 : 0xffffff7f825ac88f 
0xffffff801135baa0 : 0xffffff7f825ae3b8 
0xffffff801135bae0 : 0xffffff7f825ad9dd 
0xffffff801135bb20 : 0xffffff80018e52f1 
0xffffff801135bb80 : 0xffffff80018ee311 
0xffffff801135bcc0 : 0xffffff80013c5338 
0xffffff801135bdd0 : 0xffffff80012f739c 
0xffffff801135be30 : 0xffffff80012d3fe1 
0xffffff801135be80 : 0xffffff80012e8387 
0xffffff801135bf10 : 0xffffff80013f1fce 
0xffffff801135bfb0 : 0xffffff80012a3f66 
      Kernel Extensions in backtrace:
         com.apple.iokit.IOSurface(153.3)[835B5408-A88C-390F-90BC-0E6BF2DF9607]@0xffffff7f825a6000->0xffffff7f825bdfff
 
BSD process name corresponding to current thread: com.apple.WebKit
Boot args: kext-dev-mode=1 slide=8 

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Got Everything working except for my camera.    It shows up in the system report.    But if you open the Image Capture....  it states that there is no camera?

Can anybody give me hand with this?

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