Martin L wrote:

I just replaced the power supply in my old P3BF Asus motherboard

Now, when I start, I get an Hardware monitor found an error, press
DEL to enter setup and check monitor status.

In the voltages section, where it should be -5V it's -6.1V in red.

I tried another power supply and get the same error.

The computer runs fine however if I ignore this error but would
like to know why I get this.

Because the -5 line is unused, and thus unloaded.

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
http://cbfalconer.home.att.net