I find it unusual indeed that none of the hardware you indicated you tried this on worked with any of the distros involved.
How are you burning the DVDs? If memory serves you would be burning DVDs for each of these KDE distros. Distros use pretty aggressive compression and must be burned very slowly, preferably in a RAW mode. RAW mode is usually listed as DAO, SAO, or TAO. Be sure and check the md5 sum of the download and let the burning software check the accuracy of the burn.
As you may have figured out I suspect a bad burn may be the root of your problem.
Insanity: Doing the same thing over and over and each time expecting a different result.
Democracy is 2 wolves and a lamb voting on the menu. Liberty is an armed lamb protesting the electoral outcome. A Republic negates the need for an armed protest.