Actually — it now looks like
Actually — it now looks like I’ve got a bad board or CPU. After passing a 2 hour Prime95 stress test, it won’t even boot from Windows 7 install media (tried both my USB stick and my DVD media). It crashes after loading Windows usually with different BSOD specifics each time.
I turned on boot tracing for troubleshooting the hang on restart issue, and most of the time it hung on amdxata.sys, a couple of times the next one (can’t remember what it was… fltmgr.sys?). Then I turned on FastBoot in the BIOS. That seemed to fix the problem on restart (strange eh?). But a few restarts later, it would no longer start from the SSD, and in addition would no longer start from any media.
I suspected bad RAM, but I tried swapping from another system and same result. Swapping RAM of course involved removing the HSF because of the way that Big Shuriken stands over top the RAM and makes it impossible to get at the RAM chips installed in the first two slots.
At this point I suspect I need to check my RMA options at provantage.com which is where the MB/CPU came from.