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windows boot option is suddenly missing

Hi, two or three ago suddenly the boot option for Windows has disappeared. It is an Imac 27 inch, late 2013 model on OS X Yosemite 10.10.3 (14D136)

No i can only start OSX and it seems that windows was never there? How can i restore this? I normaly press ALT and then two boot options show up, recently only OSX. I did not changed anything. What i did see in the deleted items is a couple of files since the last days, maybe this is related?

Modelnaam: iMac

Modelaanduiding: iMac14,2

Processornaam: Intel Core i7

Processorsnelheid: 3,5 GHz

Aantal processors: 1

Totale aantal cores: 4

L2-cache (per core): 256 KB

L3-cache: 8 MB

Geheugen: 16 GB

Opstart-ROM-versie: IM142.0118.B09

SMC-versie (systeem): 2.15f7

iMac, OS X Yosemite (10.10.3)

Posted on Jun 30, 2015 3:06 PM

Best reply

Loner T

Level 9

59,477 points

Posted on Jun 30, 2015 4:13 PM

Was the Yosemite Recovery Update applied to your iMac?

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146 replies

Jul 9, 2015 12:28 PM in response to Loner T

Hi, i think i must go for option 2.

I checked for a flashdrive but dont have any, can we do without?

i add a new diskutil list:

Loner T

Level 9

59,477 points

Jul 9, 2015 12:35 PM in response to tomfromvleuten

1. Backup OSX as it is now.

2. Do not use Untitled.

3. Try to install using the 1TB WININSTALL and the HDD Bootcamp Part. Pick Macintosh HD, NO NAME.

4. After Windows is fully installed, post the output of sudo fdisk /dev/disk1 (this will record the MBR on this discussion).

5. We can rebuild the Fusion drive without touching the BC partition and restore OSX from the backup made in step 1.

Jul 9, 2015 12:37 PM in response to Loner T

just to make sure, by backing up OSX you mean timemachine backup?

Loner T

Level 9

59,477 points

Jul 9, 2015 12:46 PM in response to tomfromvleuten

Yes. Once you have TM backup, we can erase the SSD/HDD (OSX Part) and rebuild it into a Fusion drive.

Jul 9, 2015 1:01 PM in response to Loner T

Ones the TM backup is ready i will try to install using bootcamp and the external 1TB (wininstall) to install windows on Macintosh HD No Name. This wil make it One OS X partition. Is this right?

Will OS X still boot then?

Loner T

Level 9

59,477 points

Jul 9, 2015 1:13 PM in response to tomfromvleuten

The TM backup is for restoring your OSX side only.

Your BC partition is on the HDD. We will leave it untouched. We will erase the other partitions (disk1s2 and disk1s3) and create a Fusion drive using disk0s2 (SSD) and disk1s2 (HDD) and then restore OSX. to this Fusion drive.

The BC part will be left untouched. If we run into any issues, we can rebuild the MBR on disk1. Yes, after the restore, OSX should also boot properly.

Jul 9, 2015 2:08 PM in response to Loner T

windows has been installed. What is the next step?

Loner T

Level 9

59,477 points

Jul 9, 2015 3:06 PM in response to tomfromvleuten

Are you able to switch between OS X and Windows without any issues and are the Bootcamp drivers fully installed?

Jul 10, 2015 1:28 AM in response to Loner T

hi, yes i can switch between ios and windows but it doesnt look like all the drivers are installed. For exemple the videocard, in devicemanager i do not see my videocard but it shows a standard card. The builtin camera is also missing