So as far as DNA goes, the modern Greeks probably have inherited DNA from people who were in Greece in Neolithic and Early Bronze Age times before the Greek language was brought into Greece.
This is one of those times I wish TinyPic had survived. Had a nice map of -inthos place names I'd sort of scanned out of, I forget which book. The -inthos suffix is from Carian, which is related to other languages, possibly including Etruscan (which is related to Lemnian).