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Bootcamp Windows 7 not working after Yosemite install

I have Windows 7 installed via bootcamp and after installing Yosemite, windows was no longer available via System Preferences>Startup Disk. However, it was still accessible using restart and holding alt/option. Then today I accidentally installed update 10.10.3 and now Windows is completely gone. I do not have a Time Machine Backup and have been scouring these threads for some time trying to piece together a solution to no avail.

I have seen similar threads about this topic however I have not quite found the complete solution to my specific example. Here is some info that should serve usefull to someone willing to help.

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 186.7 GB disk0s2

3: Microsoft Basic Data 64.0 GB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *4.1 GB disk1

1: DOS_FAT_32 UNTITLED 4.1 GB disk1s1

diskutil cs list

No CoreStorage logical volume groups found

sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

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 490234751

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 364564440 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

364974080 262144

365236224 124997632 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

490233856 863

490234719 32 Sec GPT table

490234751 1 Sec GPT header

sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 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 - 364564440] HFS+

3: 0C 1023 254 63 - 1023 254 63 [ 365236224 - 124997632] Win95 FAT32L

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Also...

I use this computer for work and have a lot of important stuff on the Windows side. Please help.

MacBook Pro with Retina display, OS X Yosemite (10.10.3)

Posted on Apr 13, 2015 5:23 PM

85 replies

Loner T

Level 9

59,483 points

Apr 15, 2015 3:06 PM in response to J.Amado

Please back up OSX and Windows to external disks. You do not have a recovery partition. You can get it back, if you re-install OSX.

J.Amado Author

Level 1

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Apr 15, 2015 3:10 PM in response to Loner T

Would re-intalling undo everything we just did?

Loner T

Level 9

59,483 points

Apr 15, 2015 3:12 PM in response to J.Amado

You can do it, but back up first. It would be painful to repeat this whole process all over again. 😉

J.Amado Author

Level 1

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Apr 15, 2015 5:15 PM in response to Loner T

Got it. Ok will do. Thank you so much once again. I could not have done this without your help.

J.Amado Author

Level 1

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Apr 15, 2015 6:08 PM in response to Loner T

Ok this thing is like the neverending problem. So I was on the Mac side and got distracted on the internet for a couple of hours. Something told me to use Startup to restart the computer but to remain on Mac OS to see what would happen. So I did that and now I can't get passed the password screen. I put in my password, it starts processing, and then the screen blinks and the password field is empty. And this repeats as many times as I try. Tried to reset the password using my Apple ID and it doesn't accept that either. Any thoughts?

Loner T

Level 9

59,483 points

Apr 15, 2015 6:16 PM in response to J.Amado

Can you boot in OS X Safe Mode?

J.Amado Author

Level 1

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Apr 15, 2015 6:16 PM in response to Loner T

After writing that last comment I switched back to osx to see if it would be different going back to osx from windows vs restarting osx from osx and it was the same thing. Screen blinks, password field is blank and nothing happens. Then hit restart and held alt/option, selected windows and it stayed on the black screen w/white cursor like before. Had to hold the power button to turn the machine off, turn back on, hold alt, and select windows again and then it booted normally. Also noticing that it takes longer to boot on either operating system than it used to.

J.Amado Author

Level 1

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Apr 15, 2015 6:24 PM in response to Loner T

Just tried using bootcamp icon in windows to switch back to osx to attempt to boot in safe mode. Windows took extra long to shut down. When it reset I held shift, the apple symbol came up, progress bar got all the way full, and then the computer shut down. Turned it back on and tried again, same result. Turned it back on and did not press anything, same result. Mac os not booting at all now.

J.Amado Author

Level 1

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Apr 15, 2015 6:28 PM in response to Loner T

*Correction: the progress bar only reaches a little less than a quarter of the way before it shuts down.

Loner T

Level 9

59,483 points

Apr 16, 2015 5:50 AM in response to J.Amado

You will need to install OSX on an external drive (OS X: Installing OS X on an external volume - Apple Support) or use Internet Recovery (OS X: About OS X Recovery - Apple Support).

Bootcamp Windows 7 not working after Yosemite install