Formatting Mac Mini

Good Morning / Good Evening
I'm facing a serious peoblem, my Mac Mini's DVD drive stopped working; it reads nothing!! I'm trying to format my computer without using the DVD drive. So can you please help me how to do that using an external method? I already have its original OS DVDs !!
Thanks in advance

Do you have an external Drive?
Do both your Macs have Firewire?
If so it may work to use your Install Disc in the other Mac...
If you have another Mac with Firewire, you can use it's Optical Drive for the Mini.
Put the Disc in the Other Mac, boot the other Mac into FireWire target disk mode...
http://support.apple.com/kb/HT1661
Boot the Mini with the Option/alt key held down & the Disc in the other one shoild show as a boot choice.

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