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Macbook continuosly reboots when holding c key

I am attempting to reset the admin password on a new Macbook that I just acquired. I insert the OSX 10.5 boot disc and hold c and the computer continuously reboots itself. If I wait a couple seconds after the computer starts before I push and hold c it goes right into the OS, skipping over the install utility.
2 Solutions
Try booting while holding down the option key until the boot picker appears. Then select the DVD and see if it will boot from it. If not, I suspect you have a defective (i.e. scratched) DVD, or the DVD is not a full commercial OS install DVD but instead is an OEM DVD intended for a different model Mac.
nappy_dThere are a 1000 ways to skin the technology cat.Commented:
If that is the case, it sounds like your DVD drive or the media is not being recognized.

Another method is to reset the pasword in single user mode like this:

Hold Apple+S when booting to enter single user mode
#sh /etc/rc
#passwd yourusername

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