Darwin Bootloader
Boot into Mac OSX.
Edit /Library/Preferences/SystemConfiguration/com.apple.Boot.plist with a text editor.
It should look like:<pre><?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></pre>Boot into windows and open a command prompt.
type "diskpart" and you will be at the "DISKPART>" prompt <pre>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</pre>
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.