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Fans turning on and off (almost like power is being cut on and off) - Power Supply or Motherboard problem?

post #1 of 16
Thread Starter 
Hey guys,

Recently I've noticed that my fans aren't working all of the time. Sometimes they are working fine, but most of the time they are just dead.

It's almost like my power supply is struggling to power everything and as a result it's cutting power to the fan.

This has started only recently and I am wondering if I should replace my Power Supply or my Mobo.

Thanks
Computer
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5-4670K Haswell Quad-Core 3.4GHz LG... GIGABYTE GA-Z87X-UD4H LGA 1150 Intel Z87 HDMI S... GIGABYTE GV-N670OC-2GD GeForce GTX 670 2GB 256-... G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM... 
Hard DriveOSMonitorKeyboard
SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB S... Microsoft Windows 7 Home Premium SP1 64-bit - OEM ASUS VG248QE (Light Boost Mod) DAS Keyboard Silent (Brown Keys) 
PowerCaseMouseMouse Pad
CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12... CM Storm Trooper CM Storm Spawn - 3500 DPI Optical Gaming Mouse ... Artisan Zero XSoft 
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Sennheiser PC 360  Xonar DX 
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Computer
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CPUMotherboardGraphicsRAM
Intel Core i5-4670K Haswell Quad-Core 3.4GHz LG... GIGABYTE GA-Z87X-UD4H LGA 1150 Intel Z87 HDMI S... GIGABYTE GV-N670OC-2GD GeForce GTX 670 2GB 256-... G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM... 
Hard DriveOSMonitorKeyboard
SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB S... Microsoft Windows 7 Home Premium SP1 64-bit - OEM ASUS VG248QE (Light Boost Mod) DAS Keyboard Silent (Brown Keys) 
PowerCaseMouseMouse Pad
CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12... CM Storm Trooper CM Storm Spawn - 3500 DPI Optical Gaming Mouse ... Artisan Zero XSoft 
AudioAudio
Sennheiser PC 360  Xonar DX 
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post #2 of 16
Are they connected to the motherboard headers or from the power supply via molex?
Black Z170
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120GB Samsung 750 EVO 500GB Samsung 750 EVO Corsair Hydro Series H100i V2 6x 20mm EK Vardar F4-120ER Cooling Fans in Black 
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Thermaltake Commander FP Windows 10 Pro 64-bit QPAD MK-90 RGB Pro 850W EVGA Supernova P2 with EVGA Black Braided ... 
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Black Z170
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Intel Core i5 6600K MSI Z170A GAMING PRO CARBON MSI GeForce GTX 1080 SEA HAWK X 8GB 16GB (4x4GB) Corsair DDR4 Vengeance LPX Black P... 
Hard DriveHard DriveCoolingCooling
120GB Samsung 750 EVO 500GB Samsung 750 EVO Corsair Hydro Series H100i V2 6x 20mm EK Vardar F4-120ER Cooling Fans in Black 
CoolingOSKeyboardPower
Thermaltake Commander FP Windows 10 Pro 64-bit QPAD MK-90 RGB Pro 850W EVGA Supernova P2 with EVGA Black Braided ... 
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post #3 of 16
*what are your temperatures?
*how many fans?
*is there any correlation in temperature and when the fans run/don't run?
post #4 of 16
it could be a loose connection. Changing a psu would be safe because if it fails it can take other stuff with it.
post #5 of 16
Try flipping the power switch on the front heading.
HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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post #6 of 16
I have to love all these suggestions when OP has given no info to diagnose with.
Quote:
Originally Posted by jellywolf996 View Post

it could be a loose connection. Changing a psu would be safe because if it fails it can take other stuff with it.
Yes, it could be a loose connection. Changing PSU is more than a little radical at this point in time. I would suggest checking connections first before anything else. There are many possible connection points it could be.. fan plug, fan splitter, fan socket, molex plug, molex socket.. none of which are on motherboard or in PSU.

We don't know how many fans, what temperatures are, what case it is, how fans are connected to power. All need to be answered before I would even think of trying to suggest remedy.
Quote:
Originally Posted by dixson01974 View Post

Try flipping the power switch on the front heading.
And how is this in any way connected to fans randomly stopping and starting? The "power switch on front heading" is computer on/off switch?? All it does is trip the power switch in motherboard. If it is defective the whole system will become erratic, not must the fans.
post #7 of 16
yes some more info from the op would help. are they plugged into motherboard fan headers and using software to controll the fans? reason i ask is i have an asus board and 3 of my fans were controlled by asus fan xpert and out of the blue one day those 3 fans just stopped and it turned out too be fanxpert after removing the software and reinstalling it i was ok for about a week and it did it again therefore i have removed the software for good and it's been over 2 months now with no fan issue, my fans just run full speed all the time which is ok as they are noctua fans and are very quiet.
Old X58
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i7 970 6 core ASUS Sabertooth X58 MSI GTX 1070 Gaming X GSkill 24 gigs 
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Crucial MX100 256 gig Crucial M500 120gig WD VelociRaptor 1TB Noctua 
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Old X58
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i7 970 6 core ASUS Sabertooth X58 MSI GTX 1070 Gaming X GSkill 24 gigs 
Hard DriveHard DriveHard DriveCooling
Crucial MX100 256 gig Crucial M500 120gig WD VelociRaptor 1TB Noctua 
OSMonitorMonitorKeyboard
Windows 7 Pro 64bit LG 29inch widescreen DP LG 29inch widescreen DP Corsair K65 
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EVGA SuperNova G2 1000w Corsair C70 Corsair M65 Sound Blaster Z 
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Custom sleeved psu cables 
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post #8 of 16
I meant to buy a new psu if it is old or weak like 400w
post #9 of 16
Quote:
Originally Posted by jellywolf996 View Post

I meant to buy a new psu if it is old or weak like 400w
Why?
GPU is 170watt
CPU is 125watt
A good quality 400w PSU is big enough

if ; biggest little word in English language
Edited by doyll - 1/20/13 at 10:10am
post #10 of 16
Thread Starter 
I have a total of 9 Fans:
I am using the Storm Trooper Case - there is a built in fan controller and I have 1 200mm Top Fan, 1 140mm Rear Fan, and 2 120mm Front Fans connected to it.
I also have an NZXT Mesh Fan Controller - I have 2 120mm fans that are in a push/pull on Hyper 212+ Heatsink, 1 120mm Fan on the bottom of the case, and 2 120mm Side Fans.
I forgot to mention that my Gigabyte 670 OC Fans are working all the time. It's only the other fans that aren't working.

Also - the power switch button's red led is at like 5% brightness, along with the built in fan controller rpm increments having no led (unlike it usually does).
Computer
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5-4670K Haswell Quad-Core 3.4GHz LG... GIGABYTE GA-Z87X-UD4H LGA 1150 Intel Z87 HDMI S... GIGABYTE GV-N670OC-2GD GeForce GTX 670 2GB 256-... G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM... 
Hard DriveOSMonitorKeyboard
SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB S... Microsoft Windows 7 Home Premium SP1 64-bit - OEM ASUS VG248QE (Light Boost Mod) DAS Keyboard Silent (Brown Keys) 
PowerCaseMouseMouse Pad
CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12... CM Storm Trooper CM Storm Spawn - 3500 DPI Optical Gaming Mouse ... Artisan Zero XSoft 
AudioAudio
Sennheiser PC 360  Xonar DX 
  hide details  
Reply
Computer
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5-4670K Haswell Quad-Core 3.4GHz LG... GIGABYTE GA-Z87X-UD4H LGA 1150 Intel Z87 HDMI S... GIGABYTE GV-N670OC-2GD GeForce GTX 670 2GB 256-... G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM... 
Hard DriveOSMonitorKeyboard
SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB S... Microsoft Windows 7 Home Premium SP1 64-bit - OEM ASUS VG248QE (Light Boost Mod) DAS Keyboard Silent (Brown Keys) 
PowerCaseMouseMouse Pad
CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12... CM Storm Trooper CM Storm Spawn - 3500 DPI Optical Gaming Mouse ... Artisan Zero XSoft 
AudioAudio
Sennheiser PC 360  Xonar DX 
  hide details  
Reply
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