Fans not spinning, wrong temperature reading...

G

GN85

Limp Gawd
Joined
Feb 28, 2007
Messages
252
Could this be sign of a defective mobo, or perhaps a weak PSU?

Antec True Power 500W
Phenom II X3 720
Gigabyte GA-MA790X-UD4P
2 hard drives in raid + 1 hard drive (total of 3)
geforce 7950GT

I noticed that fans spin at different speeds depending on what fan connector I plug them into. My case is open now, and I just noticed that my CPU fan is not even spinning. :eek:

Could be unrelated, but every monitoring app is reporting a core temp of less than room temperature, as low as 14 degrees celcius, when the computer is idling.

Also, I can get a stable OC that passes prime95, but my cursor starts becoming choppy/laggy. This could also be unrelated, I don't know. Not very experienced with OCing, so don't know if it's a symptom of a crappy OC, or something else.

What you guys think? Faulty mobo?
 
unless your cpu fan is dead somehow, its probably being controlled by a setting in the bios. same for the others.

you wouldn't be hte first to get crazy inaccurate sensor readings from your motherboard.

as for your OC, just camp out with the task manager and see whats eating your cpu usage.
 
To see if the GPU fan works:
[Testing the GPU]
Use Furmark or ATI Tool to stress test the GPU.

How long did you run Prime95 for? ALso have the Task manager open, as thrawn86 said, to monitor what apps are spiking.
 
K so I figured out the fan problem. It's actually the automatic fan speed control that's messed up. It spins the fans too slowly, so they don't even start.

But here's something weird: when I overclock my processor, the cursor lags when I move it around. However, when I run prime95, the lag instantly disappears. What the hell? :eek:

edit: even a slight overclock from 2.8 to 3.2, without a voltage increase causes mouse lag.
 
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do you have any kind of cpu throttling options enabled? thats the only thing I can think of.
 
Oh cool, I'm googling my issue and run into my own thread... again...

So the mouse lag was caused by the nvidia card. It was also a case on another AMD system, with another similar card (both 7900 series). Nvidia, thnxbai. :)

Still can't figure out the temperature reading problem, though. Do you guys think it could possibly be a faulty CPU? After all, core temp is reported by the CPU, isn't it?
 
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