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JC K9 Author

Level 1

0 points

Windows error loading after Yosemite upgrade

I can no longer boot my windows 7 partition after Yosemite upgrade. Please help

Any help would be greatly appreciated. Thank you

MacBook Pro, OS X Yosemite (10.10)

Posted on Oct 20, 2014 10:37 AM

54 replies

Loner T

Level 9

59,471 points

Oct 21, 2014 10:27 AM in response to Loner T

Loner T wrote:

Based on your screen shots, your NTFS partition starts at 86923264 and ends at 538218489, since you can see files. I am a bit surprised that you show the NTFS header where your current GPT#4 is (which may be you NTFS backup).

This is what I suggest. Start at Bootcamp missing after expanding partition . Once you are comfortable reading it, then the basic steps are repeated below. Please stop if you see any error messages.

1. Delete the old entry and create a new entry at GPT#4.

sudo gdisk /dev/disk0

p

d

4

n

4

86923264

538218489

0700

p

w

y

There is a problem here. Your Testdisk screen shot shows a triplet of 86923264/625141752/538218489 (start/end/size), but if you look at GPT#4 it shows a size of 451295226 which should actually be 625141752. The size and end values are swapped in the GPT you created. Delete the current GPT4 and use end value of 625141752, not 538218489. This is also confirmed by the entry that follows GPT#4 which starts at 538218490, which is the next byte where GPT4 currently ends. There is a backup NTFS bootsector at the end of the partition, that Startup Recovery should also update but it is currently beyond the partition which would explain the error you get with /fixMBR.

Fix the GPT, reboot, redo startup repair and test.

JC K9 Author

Level 1

0 points

Oct 21, 2014 11:38 AM in response to Loner T

Just when I thought we were making progress it still fails. I get windows screen to start now but then an autochk program not found error comes up and then dumps to boot manager. It asks to start windows normally or go to repair (recommended) which I select and it states fix startup issue but when I restart it fails everytime. windows splash screen appears then dumps back to boot manager cycle

Thank you again for your patience and assistance. Your truly great!

Do you have any other suggestions

Loner T

Level 9

59,471 points

Oct 21, 2014 11:59 AM in response to JC K9

What specific program (autochk?) can it not find? If the Windows screen comes, and it cycles to boot manager, it is progress but not as fast as I would like. Is your missing hardware error message gone?

JC K9 Author

Level 1

0 points

Oct 21, 2014 12:18 PM in response to Loner T

Don't know whats its looking for but now that only worked once. when I restart again and with option key my bootcamp disk isn't there anymore. I attempt to restart with windows repair disk and its tells me not able to load with this version of windows.

I go into finder and can see the bootcamp drive and preferences lets me select it but with option key at bootup its missing

Can this be fixed?

Loner T

Level 9

59,471 points

Oct 21, 2014 12:26 PM in response to JC K9

Did you recreate the Hybrid MBR after GPT#4 was corrected? You can verify if they match by checking the output of sudo fdisk /dev/disk0.

JC K9 Author

Level 1

0 points

Oct 21, 2014 3:36 PM in response to Loner T

Arrghh! I rebuilt GPT again to make sure and here is what the output is. Ran windows repair and it successfully fixed startup. I went to command prompt and bootrec /rebuildBCD and it finally found 1 windows install. I added it to the boot as requested and it rebuilt. but after restart Windows keeps starting now but the same autocheck prompt after windows splash screen. Do I have any hope? I feel were so close.

Thank you!!!

Loner T

Level 9

59,471 points

Oct 21, 2014 4:07 PM in response to JC K9

Cannot see the screen shots. Can you post images via an external image sharing service?

JC K9 Author

Level 1

0 points

Oct 21, 2014 4:18 PM in response to Loner T

http://i61.tinypic.com/2dqq3a1.png

http://i58.tinypic.com/2i9i3hu.png

Loner T

Level 9

59,471 points

Oct 21, 2014 5:38 PM in response to JC K9

These two look good. You may want to edit your name out of the first image, if you do not want it to be visible, or replace it.

JC K9 Author

Level 1

0 points

Oct 22, 2014 9:10 AM in response to Loner T

Ok Thanks. Do you have any more suggestions from here. Its looks more to be a windows issue although it was working fine prior to Yosemite upgrade.

I appreciate all your help with this. It has been a mess but I have at least gotten to access the partition with my files.

Loner T

Level 9

59,471 points

Oct 22, 2014 9:19 AM in response to JC K9

Does startup repair still give you the Stop Error? If you are able to see an OS via /scanOS, do the steps to fix the BCD work?

JC K9 Author

Level 1

0 points

Oct 22, 2014 9:28 AM in response to Loner T

I can run startup repair and it keeps saying startup repair cannot repair this computer. When I drop to command prompt and run bootrec /scanos it finds no OS installations. I went deeper and backed up the BCD data as described in windows article you sent. I ran /RebuildBCD and it found the OS and rebuilt the BCD. Restart and back to the same Autochk can be found skipping Autocheck. In my research of that issue it says to rebuild BCD. It seems to be stuck in this loop and Im not sure where to go from here. I feel so close but now what.

I appreciate all your help and patience with this