My hearing is so poor that I asked my wife to listen. She says she can hear "a fan". I can see what I believe is a fan, through the back of the cabinet, but it does not seem to be spinning quickly. Nor is there a plethora of dust.
A couple of remembers: a few days of very frequent video driver failures/recovers. Then the "corrupt" external drive problem. Now the boot.crash.reboot and all seems to be fine.
I hate computers.