Mac mini boot error, i have tried everything!

i upgraded my mac mini to 10.5 from 10.4 and it worked great, but i wanted to "erase and install" so i went back to do it and it was just doing it, when i had a power cut, the mac went off and when the power came back on, i turned on the mac and i got the Grey apple logo with the spinning gear underneath and it doesn't go past this. i have tried doing the keyboard shortcuts (power and holding shift ect.) but my mac wont respond, i have inserted the original restore disk and nothing happens, in fact i can't get it out even if i wanted to.
has anyone got any ideas what could be the matter with it? and how to fix it.
i would be so unbelievably grateful.
thanks in advanced
jack.

Using a wired USB keyboard, hold the OPTION key (ALT if it's a PC keyboard) down as soon as you see the grey logo while the mini starts up. This should take you to a screen where it shows you any available boot volume (normally the internal drive and the optical if there's an install disc inserted - though in your case the internal drive won't appear if it was in the process of installing). If that screen comes up and the install disc shows, click on that and click on the arrow icon to complete booting to the installer. After that you can select the option button, select erase and install, and complete a reinstall of MacOS (the erase will be necessary because you may have damaged directories on the drive resulting from the power cut if the disc was being written.).
If the install disc doesn't show up in that screen, reboot the system, and hold the (left) mouse button down to try and eject the disc.

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