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Can't install window 8.1 on Mac book pro Mid 2012. Bootcamp restarts and it shows black screens with "_" blinking

My mac book pro 2012 will not install window 8.1. After boot camping all the steps, it he device restarts and black screen pop and "_" this thing blink and nothing happens. I tried using wininstall USB after formatting the partition it says it Can not install because format of the partition is different.

help me I want to us window for my business system

MacBook Pro, Mid 2012 betatester of new Yosemite

Posted on Apr 20, 2015 6:17 AM

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Question marked as Best reply

Posted on Apr 21, 2015 11:13 PM

Can you post the output of the following Terminal commands?


sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0


Sudo commands require your password, which is not echoed back to you. You may also see a warning about improper use, and potential data loss, if abused.

15 replies

Apr 21, 2015 1:33 PM in response to Gabrielkbkim

okay so i have done the job but still gives me flicker stuff i have done the command and here it is

Last login: Tue Apr 21 15:28:18 on console

***-MacBook-Pro:~ ***$ sudo gpt -vv -r show /dev/disk0


WARNING: Improper use of the sudo command could lead to data loss

or the deletion of important system files. Please double-check your

typing when using sudo. Type "man sudo" for more information.


To proceed, enter your password, or type Ctrl-C to abort.


Password:

gpt show: /dev/disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 1953525167

start size index contents

0 1 MBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 1365908480 2 GPT part - 48465300-0000-11AA-AA11-************ECAC

1366318120 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-***********ECAC

1367587656 1208

1367588864 585934848 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1953523712 1423

1953525135 32 Sec GPT table

1953525167 1 Sec GPT header

***-MacBook-Pro:~ ****$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 1365908480] HFS+

3: AB 1023 254 63 - 1023 254 63 [1366318120 - 1269536] Darwin Boot

4: 0B 1023 254 63 - 1023 254 63 [1367588864 - 585934848] Win95 FAT-32

Apr 21, 2015 6:54 PM in response to Loner T

Last login: Tue Apr 21 15:30:22 on ttys000

*******-MacBook-Pro:~ ********$ sudo fdisk -e /dev/disk0

Password:

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> p

Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]

Offset: 0 Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 1365908480] HFS+

3: AB 1023 254 63 - 1023 254 63 [1366318120 - 1269536] Darwin Boot

4: 0B 1023 254 63 - 1023 254 63 [1367588864 - 585934848] Win95 FAT-32

fdisk: 1> setpid 4

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

4: 0B 1023 254 63 - 1023 254 63 [1367588864 - 585934848] Win95 FAT-32

Partition id ('0' to disable) [0 - FF]: [B] (? for help) 07

fdisk:*1> flag 4

Partition 4 marked active.

fdisk:*1> p

Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]

Offset: 0 Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 1365908480] HFS+

3: AB 1023 254 63 - 1023 254 63 [1366318120 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [1367588864 - 585934848] HPFS/QNX/AUX

fdisk:*1> w

Device could not be accessed exclusively.

A reboot will be needed for changes to take effect. OK? [n] y

Writing MBR at offset 0.


And should i restart the computer and press option and go to EFI BOOT?

Can't install window 8.1 on Mac book pro Mid 2012. Bootcamp restarts and it shows black screens with "_" blinking

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