Darwin Bootloader

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Boot into Mac OSX.

Edit /Library/Preferences/SystemConfiguration/com.apple.Boot.plist with a text editor.

It should look like:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Kernel</key>
    <string>mach_kernel</string>
    <key>Kernel Flags</key>
    <string></string>
    <key>Boot Graphics</key>
    <string>Yes</string>
    <key>Timeout</key>
    <string>10</string>
    <key>Quiet Boot</key>
    <string>No</string>
</dict>
</plist>
Boot into windows and open a command prompt.

type "diskpart" and you will be at the "DISKPART>" prompt

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
-------- ---------- ------- ------- --- ---
Disk 0 Online 56 GB 0 B

DISKPART> select disk 0

Disk 0 is now the selected disk.
DISKPART> list partition

Partition ### Type Size Offset
------------- ---------------- ------- -------
* Partition 1 Primary 32 GB 32 KB
Partition 2 Unknown 24 GB 32 GB

DISKPART> select partition 2

DISKPART> list partition

Partition ### Type Size Offset
------------- ---------------- ------- -------
Partition 1 Primary 32 GB 32 KB
* Partition 2 Unknown 24 GB 32 GB

DISKPART> active

DiskPart marked the current partition as active.

DISKPART> Exit

Shutdown Windows.

Start the computer.

You will be prompted to press a key to get the Boot selector or it will time out in 10 seconds and boot OSX.

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