Just got a custom machine built, noted boot errors when the power has been re-applied after having been off for more than about 10 minutes. After shutting down properly, I then pull the plug for safeguards from lightning strikes on the power grid. I first thought the boot-up problem was related to known problems when external HDDs (2TB and a 3TB WD) are connected before start-up, which masked the power restoration issue. Got suspicious when I got the same problem with the external HDDs disconnected. Ran the same tests several times, got consistent results. I thought possibly the memory battery was weak, but I don't think so because the clock doesn't reset when the 120 volt power has been unplugged. My troubleshooting/diagnostic techniques are based on 40+ years of two-way radio repair, with having to learn computers "the hard way" over the last ten years or so. Sorry if I didn't mention more "numbers",
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