Switched startup disc and now can't start...

i tried to boot up from an old disc warrior cd, and couldn't. i switched the startup disk in sys pref, and now can't start the computer at all (i keep getting the message "you need to restart your computer...") now i know i need a new version of DW, but how do i start up from my hard drive??
Thanks.

Here's something that should work:
Restart the computer in single-user mode by pressing and holding down COMMAND-S immediately after the chime until the computer starts to a black screen with white print. At the prompt enter the following commands pressing return after each:
prompt> /bin/df
(to get the /dev name of the drive)
prompt> /usr/bin/hdiutil eject -force /dev/drivename
(where you got drivename from df)
If you are successful you can restart the computer by entering "reboot" at the prompt (without the quotes) and pressing return.
If you are not comfortable using the command line you can also eject the disk manually by inserting a straightened large paperclip into the small eject hole located on the side of the optical drive slot.

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http://www.apple.com/support/downloads/macosx1048comboupdateppc.html
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http://discussions.apple.com/thread.jspa?messageID=3084827&#3084827
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Switched startup disc and now can't start...

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