A while ago I mentioned a little tip that you can use to view the boot up text on your Mac. It enabled you to view the verbose output of all of the various commands that your computer uses during the boot phase. Kevin kindly left a comment mentioning how you can set the boot up text to be always visible. It doesn’t take long to implement. This tip does carry a warning of be careful. As you do edit system files that really can stop your Mac from booting up.
The first step will be to open up a Property List editor. If you have the developer package installed from your OS disk open Property List Editor in /Developer/Applications/Utilities. This program is designed to show you the various properties that a plist file uses. If you don’t have the developer package installed you can always download and use PlistEdit Pro, it is similar to the one in the developer package except you have to pay.
The next step is to navigate to /Library/Preferences/SystemConfiguration this holds a couple of system wide preference files. Open up com.apple.Boot.plist into your favourite editor. This is the preference file used when your computer starts up and shutsdown.
In your editor change Kernel Flags to -v and then save out. If you are having problems with saving out due to permissions errors you may need to change your file permissions. Simply right click on the file go to Get Info and add yourself to the permissions list at the bottom. You may have to use your admin password.
If you can’t get the correct permissions to work and you want a quicker one line way open up Terminal and type the following.
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.boot "Kernel Flags" -v
That will write using using your admin powers the the plist file in the correct location. It will change Kernel Flags it -v. If you want to revert the plist back and have the splash screen visible simply type in Terminal again.
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.boot "Kernel Flags" ""
You will then be back to normal. Its a simple and effect method if you are interested in viewing the boot up text. Just remember you are editing system files. This trick did work for me. But it may not work for you. So exercise caution. Thanks to Kevin for pointing this out. If you have any more tips please send them in.