Enable verbose boot:<br>
<h4>For the repair volume</h4>
<br>
mount the repair partition:<br>
<br>
mkdir /mnt/repair/<br>
mount -t hfs /dev/disk0s2 /mnt/repair/<br>
then edit /mnt/repair/com.apple.Boot.plist<br>
<br>
under key: Kernel Flags<br>
add -v before rp=:///OS.dmg<br>
<br>
<h4>For the normal OSBoot Volume</h4>
<br>
edit /System/Library/CoreServices/com.apple.Boot.plist<br>
<br>
under key: Kernel Flags<br>
add -v<br>