[Solved] CPU Fan Error after Power Outage, Everything seems else OK

nekomastermax

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Jan 22, 2009
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We just had a 15 minute power outage at random while I was in the middle of playing Battlefield 3 on my gaming computer.

While I do have my computer plugged into a surge protector, everything is plugged into a switched power outlet, so during the outage I switched the outlet off until power returned to prevent any serious surge damage incase my protector doesn't handle it.

I use a Corsair H60 Liquid cooler, with a single fan radiator sandwiched between two 120mm fans.

Anyways, when I booted my computer up when the power returned, my ASUS motherboard BIOS is now giving me CPU fan speed errors, telling me that its running slower then the warning speed (Default Warning Speed is 500 RPM). Looking at my bios monitoring screen its showing my CPU temps are fine but my fan speed after a cold boot is 350 rpm and steadily rising.

The pump and fans seem to be running fine, no weird sounds or vibrations, just the usual quiet hum of the pump that I've heard since day one of installation (its not very loud, I have to actually get pretty close to here the pump).

I dunno what happened, I'm not overheating. My AMD Normally runs at about 40*C idling and may get up to 55*C under HEAVY load (probably would run cooler if I clean out the radiator but its not that dirty yet and its a pain to remove the radiator and fans to clean it and replace the set up after) but for the most part it seems to be doing its job and I'm not crashing or rebooting from heat.

I hope that it isn't anything serious as I don't have any money to fix or replace anything, and I wont have money in the foreseeable future (considering the lack of unskilled labour in Southern Ontario right now)
 
Solution
Whelp turns out the error was actually effecting a different fan and not my H60 cooling pump. Turns out my ASUS M5A97 R2.0 Motherboard has the orientation of the Computer Fan connectors in a weird order.

Just behind the I/O ports, is CHAssie Fan 1, then right next to my CPU socket are 3 more connectors. In order from back (I/O side) to front, the connectors go CHA 2, CPU 1, CHA 3... and my Top 200mm fan was connected to the CPU fan header.

So in the end, my CPU and liquid cooler is fine, though I still opened up my computer and removed the liquid cooler to clean out the radiator and replace the thermal paste. I've now gone from 56-60*c idle to 35-40*c with my AMD Phenom II x4 965 BE (OC'ed to 3.70Ghz). I think all will be well for now.

Eximo

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Interesting. Double check your 12V is still at or around 12V, power supply could have been damaged. Low 12volt would cause the fan to spin a little slower.

If you don't have anything in the BIOS you want to keep, try clearing it out and seeing if the issue goes away. Might also try flashing the BIOS.

Not sure if your motherboard has a dual bios, but power outages can be preceded by spikes and sags before the line protection kicks in, but it could have conceivably switched to a backup chip. It may not be as updated as what you had and has a lower tolerance for low RPMs. Pretty far fetched though. Anything powerful enough to damage or wipe an eeprom would likely have made other parts fail.
 

nekomastermax

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Jan 22, 2009
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So I just checked my UEFI BIOS and its showing nominal readings on the 12 volt rail (normally hovers around 11.9 volts and 12 volts), all other voltages seem fine as well.

Also I have many other fans in my computer other then the Liquid cooling pump and the two fans for the radiator (which connect to the pump, which in turn connects with a 3 pin cable to the CPU fan connector on my mobo) and all my other fans are running just fine, I have a bottom fan, a front fan, a top fan and 2 side fans with their own thermal sensor (which I normally bury into the heat sink of my GTX 570 Super Overclocked)

After some time though, the computer registers my CPU Fan/Pump as running at over 600 RPM when I leave it going for about 5-10 minutes.
 

nekomastermax

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Jan 22, 2009
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Whelp turns out the error was actually effecting a different fan and not my H60 cooling pump. Turns out my ASUS M5A97 R2.0 Motherboard has the orientation of the Computer Fan connectors in a weird order.

Just behind the I/O ports, is CHAssie Fan 1, then right next to my CPU socket are 3 more connectors. In order from back (I/O side) to front, the connectors go CHA 2, CPU 1, CHA 3... and my Top 200mm fan was connected to the CPU fan header.

So in the end, my CPU and liquid cooler is fine, though I still opened up my computer and removed the liquid cooler to clean out the radiator and replace the thermal paste. I've now gone from 56-60*c idle to 35-40*c with my AMD Phenom II x4 965 BE (OC'ed to 3.70Ghz). I think all will be well for now.
 
Solution