Windows 10 on Macbook: "No audio output Device is installed"

1. On the OS X side, insert your USB and post the output of the following Terminal command.

diskutil list

2. Check your USB in the following System Report.

3. Can you check About This Mac and post the exact Mac Model Identifier string? Please do not post your Mac's serial number.

Your NVRAM variables are confusing BCA. Please run the following two procedures and try again. Do not interrupt the BCA booting with Alt/Option. Select only the Install Windows option and wait till you get to teh partition selection screen.

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

You do not have a BC/Windows partition yet, hence you do not have a valid MBR.

1. Please boot in Safe Mode - Try safe mode if your Mac doesn't finish starting up - Apple Support and then boot normally and test BCA partition creation.

2. If that does not work, please try Using Disk Utility to verify or repair disks - Apple Support and try BCA.

3. If that does not work, please try Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support and try BCA partitioning.

4. This is the last option -

a. Back up OSX using Time Machine - Mac Basics: Time Machine backs up your Mac - Apple Support.

b. Boot into Internet Recovery - OS X: About OS X Recovery - Apple Support.

c. Erase your internal drive and restore from the TM backup in Step 1 - OS X Yosemite: Recover your entire system.

You are doing Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support .

Boot into Internet Recovery using Command+Opt+R after you power up the Mac (you need to see a spinning globe). Please use a wired connection.

In Utilities -> Terminal in Recovery Console run the steps in section Use fsck if necessary on disk0 - your internal disk.

These steps are different than others. We need to use all defaults supplied by Gdisk.

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers.

1. Sudo gdisk /dev/rdisk0
2. P (Print list of parts)
3. R (Recover)
4. O (print current Hybrid MBR)
5. H (chooses Hybrid)
6. Partitions numbers to be hybridized: 2 3 4
7. Please see the sample Q&A.
8. O (print current Hybrid MBR)
9. W (Write the new MBR)
10. Y (Yes! write the new MBR)
11. Reboot

Here is sample Q&A for this section. Please notice the Press Enter/Return.

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): Press Enter/Return

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB): Press Enter/Return

Set the bootable flag? (Y/N): Press Enter/Return

Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Press Enter/Return

On your Mac, BCA will only choose BIOS, unless you interrupt the flow and use Alt/Option key to make changes. If you get a GPT/MBR error, it can be easily fixed. Do not use Alt/Option key once BCA starts the reboot, till you get to the Partition selection screen for the designated Windows partition. You will need to format the BC partition only. Do not choose or select any other partition, otherwise you will lose data.

Please create a new PMBR using the following steps.

sudo gdisk /dev/disk0

r

o

x

n

o

w

y

Reboot.

Here is an example. In the example I 'q'uit, instead of 'w', 'y'.

sudo gdisk /dev/rdisk0

Password:

GPT fdisk (gdisk) version 1.0.0

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): ?

b back up GPT data to a file

c change a partition's name

d delete a partition

i show detailed information on a partition

l list known partition types

n add a new partition

o create a new empty GUID partition table (GPT)

p print the partition table

q quit without saving changes

r recovery and transformation options (experts only)

s sort partitions

t change a partition's type code

v verify disk

w write table to disk and exit

x extra functionality (experts only)

? print this menu

Command (? for help): x

Expert command (? for help): ?

a set attributes

c change partition GUID

d display the sector alignment value

e relocate backup data structures to the end of the disk

g change disk GUID

h recompute CHS values in protective/hybrid MBR

i show detailed information on a partition

l set the sector alignment value

m return to main menu

n create a new protective MBR

o print protective MBR data

p print the partition table

q quit without saving changes

r recovery and transformation options (experts only)

s resize partition table

t transpose two partition table entries

u replicate partition table on new device

v verify disk

w write table to disk and exit

z zap (destroy) GPT data structures and exit

? print this menu

Expert command (? for help): r

Recovery/transformation command (? for help): o

Disk size is 1954210120 sectors (931.8 GiB)

MBR disk identifier: 0x028A47A7

MBR partitions:

Number Boot Start Sector End Sector Status Code

1 1 409639 primary 0xEE

2 409640 1449034287 primary 0xAF

3 1449034288 1450303823 primary 0xAB

4 * 1450305536 1954209791 primary 0x07

Recovery/transformation command (? for help): x

Expert command (? for help): n

Expert command (? for help): o

Disk size is 1954210120 sectors (931.8 GiB)

MBR disk identifier: 0x00000000

MBR partitions:

Number Boot Start Sector End Sector Status Code

1 1 1954210119 primary 0xEE

Expert command (? for help): q

No. Do not remove EFI partition. If Step 1 did not work, try Step 2.

On a working machine...

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 741.7 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data rMBPBCMP 258.0 GB disk0s4

sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 0 0 2 - 25 127 14 [ 1 - 409639] <Unknown ID>

2: AF 25 127 15 - 1023 54 16 [ 409640 - 1448624648] HFS+

3: AB 1023 54 17 - 1023 60 39 [1449034288 - 1269536] Darwin Boot

*4: 07 1023 87 51 - 1023 238 3 [1450305536 - 503904256] HPFS/QNX/AUX

sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=1000555581440; sectorsize=512; blocks=1954210120

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 1954210119

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 1448624648 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

1449034288 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

1450303824 1712

1450305536 503904256 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1954209792 295

1954210087 32 Sec GPT table

1954210119 1 Sec GPT header