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Fans spin 1 second and powers off

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December 14, 2011 4:53:00 PM

Hi All,

Doing a build for a buddy and having an awful time. Tested initially before adding any drives and all fans spin up for 1 second and power off

Parts
Asus P5G41T-M LX Socket 775 (first mobo)

Asus P5G41T-M/CSM (second mobo - exact same issue)

G.SKILL NQ Series DDR3 1333MHz (PC3-10666) 4GB (2x2GB) Dual Channel Kit (F3-10666CL9D-4GBNQ)

Intel Pentium Dual Core E5800 Socket LGA775, 3.2GHz, 800MHz FSB, 2MB L2 Cache, 45nm (Retail Box) (BX80571E5800)

Corsair Builder Series CX430 V2 430 Watt 80 PLUS Certified Power Supply (CMPSU-430CXV2)
and/or Corsair Builder Series CX500 V2 500 Watt 80 PLUS Certified Power Supply (CMPSU-500CXV2)

Thermaltake V3 Black Edition Mid Tower Case (VL80001W2Z)

on the first motherboard after it wouldnt post I pulled the motherboard out and ran it on its cardboard box to rule out shorting from the case. Same issue. Then pulled all extra cables and ran basic with just power switch, no case fan, only CPU/heatsink-fan and PSU (both 24 pin and 4 pin connected)

Tested both power supplies on another PC and worked. Also tested plugging above build into other power outlets. Same issue.

Pulled memory and ran 1 stick and also ran with no RAM (not sure if this MOBO will post without RAM and I havent been able to confirm or deny that)

Figured based on above issue was with MOBO so returned and picked up the other one noted above. Installed in case and same issue.

Went through steps above and same issue. Connected case power switch wire to other PC to confirm that worked and was able to power up other PC.

At this point the only thing I can think of is CPU/Fan which I think is rare (although this whole situation seems rare) or the RAM

I had my buddy return the CPU and grab another one and also picked up a different type of RAM (closest match to QVL list on Asus site

Anyone have any other ideas I may have missed?

More about : fans spin powers

December 14, 2011 5:09:50 PM

i was begining to think cpu fan myself, see what happens when your buddy gets back, but sounds to me the culprit may be the fan wasnt turning fast enough, or your mobo may require a fan with a sensor to monitor that its turning. Anywho those were my thoughts initially reading your post, lets see what happens when your friend gets back.
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December 14, 2011 5:13:01 PM

fatboycarney said:
Hi All,

Doing a build for a buddy and having an awful time. Tested initially before adding any drives and all fans spin up for 1 second and power off

Parts
Asus P5G41T-M LX Socket 775 (first mobo)

Asus P5G41T-M/CSM (second mobo - exact same issue)

G.SKILL NQ Series DDR3 1333MHz (PC3-10666) 4GB (2x2GB) Dual Channel Kit (F3-10666CL9D-4GBNQ)

Intel Pentium Dual Core E5800 Socket LGA775, 3.2GHz, 800MHz FSB, 2MB L2 Cache, 45nm (Retail Box) (BX80571E5800)

Corsair Builder Series CX430 V2 430 Watt 80 PLUS Certified Power Supply (CMPSU-430CXV2)
and/or Corsair Builder Series CX500 V2 500 Watt 80 PLUS Certified Power Supply (CMPSU-500CXV2)

Thermaltake V3 Black Edition Mid Tower Case (VL80001W2Z)

on the first motherboard after it wouldnt post I pulled the motherboard out and ran it on its cardboard box to rule out shorting from the case. Same issue. Then pulled all extra cables and ran basic with just power switch, no case fan, only CPU/heatsink-fan and PSU (both 24 pin and 4 pin connected)

Tested both power supplies on another PC and worked. Also tested plugging above build into other power outlets. Same issue.

Pulled memory and ran 1 stick and also ran with no RAM (not sure if this MOBO will post without RAM and I havent been able to confirm or deny that)

Figured based on above issue was with MOBO so returned and picked up the other one noted above. Installed in case and same issue.

Went through steps above and same issue. Connected case power switch wire to other PC to confirm that worked and was able to power up other PC.

At this point the only thing I can think of is CPU/Fan which I think is rare (although this whole situation seems rare) or the RAM

I had my buddy return the CPU and grab another one and also picked up a different type of RAM (closest match to QVL list on Asus site

Anyone have any other ideas I may have missed?





It seems like you have done all the proper trouble shooting steps. Its not the PSU cause you tried 2. Its not the board cause you tried 2. Its not the case cause you have it bread boarded. Its not the ram cause the board would start and beep at you. Its not the cooler cause it would take the chip a few seconds/minutes to get to shut down temp if that was wrong.

My only guess is the cpu. Try to start the board with no CPU. If it has the same behavior then the chip is most likely the issue. Try another chip or check to see if you got thermal paste on the CPU contacts that hit the board pins.
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December 15, 2011 1:49:16 AM

So looks like I figured it out but it is totally weird.. I tried new CPU and RAM and still no go, bread boarded again..same thing... For some reason I thought to give booting the new build with another power supply so I grabbed the old box I had been testing with (which booted from the Corsair PSU) and connected its power supply (20 pin even) and it freaking booted or at least stayed powered on????

Does that make any sense? Is it possible both Corsairs are bad even though they were able to boot the old machine> :??: 

Either way I guess they will be returned and grab another PSU, any recommendations?
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January 16, 2012 9:17:18 AM

fatboycarney said:
So looks like I figured it out but it is totally weird.. I tried new CPU and RAM and still no go, bread boarded again..same thing... For some reason I thought to give booting the new build with another power supply so I grabbed the old box I had been testing with (which booted from the Corsair PSU) and connected its power supply (20 pin even) and it freaking booted or at least stayed powered on????

Does that make any sense? Is it possible both Corsairs are bad even though they were able to boot the old machine> :??: 

Either way I guess they will be returned and grab another PSU, any recommendations?


I got same problem as you did, my first guess was that problem is in PSU, so I tried 3!! different new PSU and none of them worked.

System works only with old FSP 400W PSU. Still haven't got solution.
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