CPU Fan Problem

[GeekDrew]

This has got me really confused... the fan on my CPU quit running, so I changed fans, and still nothing. I tried attaching a fan to the motherboard's other fan connector, but nothing. Right now I have another motherboard sitting beside my computer powering the fan on my CPU.

I just got home tonight, and the CPU fan port on my motherboard suddenly decides to work. I know this because I have a spare fan plugged into it, just there, not attached to anything. It wasn't on when I first turned on the computer, but it was about 30 seconds after I turned on the system.

Can anyone think of a reason why it could be doing this?

 

[Bleep]

check your power saving features. the machine may have went to sleep
Bleep

 

[GeekDrew]

No, I checked that...
the power saving features didn't indicate anything along those lines.

Besides that, it should have been running in DOS mode, and while accessing the BIOS, shouldn't it?

 

[Sharkmeat]

Check your power supply

 

[GeekDrew]

I've tried three different power supplies, but then again, that really shouldn't matter, since it's powered through the motherboard, should it?