I realize that this is generally frowned on, but I believe this is one
of those situations where it's best to reply to a multiple posts at once.
I did not see Samuel's response to Ed's suggestion regarding
/usr/sbin/memtest-setup until after I tried it. It worked. Perfect
score. I agree with Samuel: it's the same as the memory test on the
Fedora Live USB flash drive.
I was interested in knowing if the on-line free memtest that Ed pointed
to was better than what I already did. I got it onto a USB stick as per
instructions. But when I try to boot with the stick in the port, the
boot process jumps directly into the normal grub menu. It does not give
me a chance to go into the bios screen and ask to boot off that stick.
I lost a lot of time on this today, and trying to boot from the Fedora
Live USB stick yesterday. Why do I often not get the opportunity to go
into the bios screen when I want to? (I am not blaming anyone on this
list for that; Ed's suggestion is good.)
The two very old /boot/*rescue* files that Samuel suggested I delete are
gone. Next patching (dnf --refresh upgrade) is planned for Thursday.
Connectors, boards, and wires are fine. The smaller fan on the
motherboard was replaced quite recently. Things were cleaned then; it's
all still clean. (By the way, I'm in a very low-humidity climate,
indoor relative humidity often below 10%, so the presence of mold,
mildew, or "green" (copper compound?) would surprise me.) The fans all
look and sound like they're working as they should.
I'd like to address key questions before going on with
alt.fedoraproject.org. I'll put those in a separate post shortly.
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