Bootcamp is not bootable after creating new partition

You should see a hanging line cursor at the top left of your black screen. As Christopher suggested, Startup repair and bootrec.exe, if necessary, should help.

I still think it is risky and hosts may take this thread down for mentioning a Beta OS.

I suggest you try and repair first before you delete the other partitions.

The reason to push you away from the current setup is to prevent data loss and keep testing and non-test environments separate.

You can always install Beta OS on an external drive. My testing has been using a FW/USB external enclosure.

From the other thread's gpt command:

138674176 351559680 6 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

This is the Bootcamp entry. Strictly speaking you have an unsupported installation with 6 partitions, you'd have to delete two to get it back to something supported. I think it's kinda sloppy Apple let's Yosemite install along side an existing OS X and Bootcamp install, of course it's going to break it. But whatever.

You *can* do something non-standard if you're willing to learn new things, and understand the risk. You can use gdisk to create a new hybrid MBR, and instead of the normal kind with GPT partitions 2 3 4 added to the hybrid MBR, you can add only 6. This will cause GPT partitions 1 through 5 to be stuffed into MBR partition 1 as a protected partition type 0xEE. So Windows won't even see your other partitions at all, which means in Windows you won't have the usual read-only HFS+ support for an existing Mac volume. But at least your other partitions are safe and you don't have to delete anything. On the not so good side, any time you make any change (add or subtract or resize) and OS X volume, it will break Windows from booting again and you'll have to manually create a new hybrid MBR.

Christopher Murphy wrote:

You *can* do something non-standard if you're willing to learn new things, and understand the risk. You can use gdisk to create a new hybrid MBR, and instead of the normal kind with GPT partitions 2 3 4 added to the hybrid MBR, you can add only 6. This will cause GPT partitions 1 through 5 to be stuffed into MBR partition 1 as a protected partition type 0xEE. So Windows won't even see your other partitions at all, which means in Windows you won't have the usual read-only HFS+ support for an existing Mac volume. But at least your other partitions are safe and you don't have to delete anything. On the not so good side, any time you make any change (add or subtract or resize) and OS X volume, it will break Windows from booting again and you'll have to manually create a new hybrid MBR.

Is there further guidance out there for an approach like this by chance? I'm looking to triple boot my 2014 MacBook Pro with Mavericks, Win7, and Ubuntu. This applies to the bootcamp subject because it is not possible to install Windows 7 without Bootcamp due to USB3 drivers on this model. Making it a required first step. As of now, I have the bootcamp hybrid MBR set up properly with Win 7 working -- though knowing any partition edit will mess this up. Using rEFInd boot manager already.

Current:

$ 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 210.1 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 40.0 GB disk0s4

The additional that will put me past the supported 4:

5. Ubuntu 14.04

6. Ubuntu SWAP [may be able to avoid this with swap file instead]

7. Shared FAT32 space ~4GB [can also toss this if it puts me one partition over]

Any input? Would be hesitant to drop the Apple Recovery Partition if at all possible. May be more appropriate to start a separate thread if there's not a guide already out there.

I suggest a separate thread would be cleaner.

Loner T wrote:

I suggest a separate thread would be cleaner.

Thanks. Created alternate thread: https://discussions.apple.com/thread/6511286

Don't believe I can edit out or delete the former.