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Yes, the 3rd is all you need to startup the system and do the installation. When burning the DVD, make sure you burn the raw disk image and not a mounted filesystem, otherwise the DVD will not contain the boot code. There is plenty of info on the web how to burn ISO images.
I re-burned the exact same ISO image I had saved onto my hard disk using a different DVD drive other than my internal DVD drive. This did the trick.
Looks like it’s time for a new internal DVD drive !