Follow-up: Computer with replacmeent CPU POSTS but doesn't boot.

[VanguardLH]

Why shut down at 40C, just because the fan isn't running?

You find 15 seconds or even 1 minute a useful period of time to wait for
Windows to load and try to do anything when the CPU is then overheated
and shuts down your computer? Obviously a CPU with no cooling isn't
going to stay at 40C.

Yes. Phoenix Technologies, bios dated 03/18/2005. Motherboard manual ...
http://www.ecs.com.tw/ECSWebSite/Pr...ilID=453&DetailName=Feature&MenuID=24&LanID=0

It has a shutdown temp specification, but no settings related to fan failure,
and the system does not shutdown if I stop the fan, or unplug it.

Yep, the manual shows no BIOS setting for monitoring CPU fan RPM. Well,
I guess if you go back far enough (2004, in this case) there is some
feature that won't exist in really old hardware. Go back far enough and
ACPI and LBA aren't available, too.