PC turns on, CPU and GPU fans do not spin, PSU and case fans do. No BIOS

[Takeshi Kovacs]

Hi and thanks in advance for any help.
For a while my PC has been intermittently and randomly restarting. I put this down to possible overheating, first of components but I have conky and no real temperature spikes were happening. So then thinking maybe PSU.
However, today (after sometime of the restarts not happening but then starting to happen again in the last few days) it restarted and was taking a long time to go through BIOS to GRUB loader (I dual boot). Either I pressed the reset button or it restarted again (I don't remember) and no beep, nothing. I checked inside and noticed the CPU fan wasn't spinning, then realised the GPU fans weren't either. The PSU and case fans were though. Also, the green led showing power to the mobo was lit. The only conclusion I can come to (as I have checked the leads again and again) is that the mobo is puking up between sending power to the PSU fan and the other fans, and that is causing the BIOS to not run through error?
Sorry for the long post but best to put in as much info as possible, yes?
Cheers

 

[maxwellmelon]

sounds like cpu and gpu is over heating due to fans not running. a major issue. don't keep running your system till you figure out why. its seems slow because cpu is throttling down speed and power to prevent it from burning up. you need to check that the cpu and gpu fans are pluged in all the way. if your motherboard bios has fan control settings in them turn them to full speed all the time and see if they run. try any unused fan connections on the motherboard and see if the fans will run off of them.

 

[Takeshi Kovacs]

sounds like cpu and gpu is over heating due to fans not running. a major issue. don't keep running your system till you figure out why. its seems slow because cpu is throttling down speed and power to prevent it from burning up. you need to check that the cpu and gpu fans are pluged in all the way. if your motherboard bios has fan control settings in them turn them to full speed all the time and see if they run. try any unused fan connections on the motherboard and see if the fans will run off of them.

After totally dismantalling all components, cleaning the case and putting it back together it started working again.Possible loose plugs in headers, but that is doubtful. I fitted the new intake fan and all seemed to be going merrily until the previously experienced episodes of randomly restarting started occuring again.
I have now tried getting sensord to work, with rrdcgi for graphs, but the man pages aren't very helpful, and no-one seems to have posted anything on the net to suggest anyone has actually used it.

So, I'm back to where I was before, with an intermittent problem that I may or may not be able to track down using sensord (part of lm-sensors). Another piece of info is that I have felt the rear exhaust area for temperature when this happens but doesn't feel in the slightest bit hot, even when it turns back on and the fans start going again.

Strange situation but if anyone has any good ideas and/or has experienced this themselves then do please give the info!

 

[Adroid]

What is your system specs? Possibly an overloaded psu

 

[Takeshi Kovacs]

What is your system specs? Possibly an overloaded psu

No chance of overload if it's healthy -
The PSU is 600w 80+ bronze and is nowhere near under stress.