Here's a clue on the apparent heating issue. I managed to play a whole 5 minutes this AM before freezing, then going to black screen, then having to reboot. When I restarted, all my case fans , which are normally running at low speed, had jacked up to high speed even tho the settings in the Bios were not changed and all temps were still well within the normal ranges. One could get the impression that the system was overheating until one checked the actual operating temps. A full cold boot restored the fans to thier normal low running speeds.
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