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  • Hardware failure? I've seen desktop motherboards suddenly "die" for no apparent reason, and sometimes eventually refuse to turn on at all - maybe the motherboard is just about done. That's if the battery really was fully charged and plugged in with an OK charger, I'd expect a sudden shutdown like that if the battery said it was full but actually was about to die
    – Xen2050
    Commented Dec 17, 2015 at 11:37
  • @Xen2050: Yes I know that's why as I said in my question I tested with a different battery and on a separate occasion a different charger too. All four seem to be working properly.
    – user21820
    Commented Dec 17, 2015 at 11:49
  • Ok, could try testing with a different motherboard next - I haven't found a really good way to test them especially for intermittent infrequent errors. Maybe it's something super obvious like exploded capacitors or something melted, but the bad ones I've seen pretty much look like new unfortunately. -- OR FIRST maybe overheating -> shutdown? Are the fans & airflow about the same as when new, or quiet (failed fan?) or less air moving - Air vents or internal fins have lots of lint/dust - try cleaning them?
    – Xen2050
    Commented Dec 17, 2015 at 12:00
  • @Xen2050: I've stressed my CPUs to continuous 100% usage on all 4 processors until the fans were at high speed (and blowing out air at a higher rate) and the laptop got quite hot but nothing went wrong. I have not opened to look inside. From the outside, it looks very clean still, no visible clumps of dust/lint.
    – user21820
    Commented Dec 17, 2015 at 12:17