Installing Lion on Mid 2007 mac mini

I recently performed a wipe on my system's hard disk. I had a mid 2007 mac mini with OS 10.5.8 installed. After the wipe, the original installation disks do not work and i am wondering how to get my computer running again and eventually upgrade to snow leopard or lion.


What exactly happens when you insert the original install DVD and try an install?
You can order Snow Leopard DVD here:
Once you have Snow Leopard yo use the Mac App Store to update