Do any of the shown values appear in red?
If not then a guess.
You have a fan that's slow to start.
The monitor is sensing the low rpm and giving the error.
By the time you get to the monitor the fan has come up to speed.
Fix....replace the fan.
Whenever I boot up my computer I get the message "Hardware Monitor found an error. Enter Power Setup menu for details." When I accessed the Power Setup menu, I found a screen which said Hardware Monitor, and this is what it said:
I don't know what to make of this, so could someone explain to me exactly what is wrong and what I should do? This has been going on for a while and I haven't really gave any thought to it until now.