I am working through these notes. Thanks for the correction on the non-BSOD. I will direct those issues there. Hopefully some of what you suggest will help with them.

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I have not had any BSODs on my system but I am experiencing a range of problems that I cannot find the cause of.

Symptoms:
The first time I turn on the computer & login, if I play any videos, the...

It just happened a 3rd time. Again when I have a video playing. Any further ideas on what to check?

Yes. I dont know if this is relevant, during both crashes, I had Netflix playing.

Digging around, I found this:
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Tried it. About 6 hours later it crashed again. Another couple of things I noticed.
- my print screen button no longer captures a screen cap. I tried the virtual keyboard too to be sure it wasnt a...

I am on a custom built system. It is fairly new -- roughly 3-4 months old. To date everything has been good, but today the computer crashed on me. No literal visible BSOD --- but my screens went...