(Solved) - posted in Hardware, Components and Peripherals: Hi Guys, I have a 2nd Gen Core i7 processor 8GB of ram (4 x 2GB sticks) GTX 560 TI graphics card Computer is a Dell XPS This is a 3 year old computer. I have returned the CPU and the Motherboard, both are new. Remove all power to hard drives and Blu-ray drive. Now, I kinda think it must be a fan, perhaps a build up of dust or something, but the fact that just opening and closing the case … Page 1 of 2 - Case fans not spinning - posted in Internal Hardware: When i am using my computer, my case fans are not spinning at all. Generally speaking case fans run at a constant speed although there may be exceptions, but the CPU fan speed usually responds to changes in CPU temperature. Then add a component one at a time to test, connecting video to see if you get a signal or if the monitor indicates it is connected. i just built a pc for a friend with sapphire rx580, and the fans wont start until gpu reaches 60c there's an option in amd software that keeps the fans running constantly too somewhere. If it sounds smooth but running fast then it may be a heat load issue which the cleaning may help with. Read. Some mainboards feature 4-pin fan headers that actually don‘t use a PWM signal on Pin 4 to control the fan speed but rather reduce the voltage on Pin 2 (like a standard 3-pin fan header). Then when I restart, same thing! http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007998%20600035590&IsNodeId=1&bop=And&Order=RATING&PageSize=30, New Build keeps rebooting and then goes to sleep. Symptoms of CPU fan stop working. Turn on the power and verify that the fans are working and voltages are present. I have still blue and amber lights in the front of the desktop. No display as well. Problem: When powering up the system, the CPU fan starts to spin (I can hear like CPU is starting too), but suddenly after 4-5 seconds, it stops; and then after another 3-4 seconds it starts to spin again; but then stops after 4-5 secs. etc. Anyway to control my case fan? Initially, the fans spin about half of a rotation before they shut off. Only GPU fan keeps spinning. I have returned the CPU and the Motherboard, both are new. Expanding the CPU section in Speccy will show you the CPU fan speed and CPU temp. Choose a higher fan speed profile in the BIOS (e.g. The Tom's Hardware Show returns at 3PM ET on January 11th! We thus recommend to look for these options in the BIOS before taking other measures. Unlike BIOS based fan speed control, the supplied software usually checks whether the fan has stopped and increases voltage accordingly or at least offer more options to set up the fan properly. If it spins, then the problem could be the motherboard or power supply unit. I had another spare GPU to test if the motherboard was fine and it booted up … So as of about a week ago, 3 of 4 of my case fans have decided that they no longer want to spin the first time I turn on my PC. They don't seem to start again. I updated the bios and as soon as the bios program began updating the bios, the fan kicked in at full speed until the bios was finished updating and then switched off again. Can't even get bios. by longvue2. At idle, just browsing the web, the card seems to heat up a lot, and the heat tubes are very hot to the touch. System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. The other possibility its that the fan is thermally controlled, and the controller is dropping the voltage below the operational range of the fan. My rear case fan spins for a couple seconds on startup, then stops. Then after at most 3 seconds, the power supply shuts down (both fans stop). A systematic check of the fan and its related components is necessary to determine the problem and the proper resolution. I updated the bios and as soon as the bios program began updating the bios, the fan kicked in at full speed until the bios was finished updating and then switched off again. When I press the start button, the light comes on. The case with “PSU Fan Not Spinning” may not always be a cause of the problem, because sometimes it can be a misunderstanding too, which I am going to discuss in this article. I have still blue and amber lights in the front of the desktop. 13 years ago In reply to Fans Spin then stop Thanks for your help, but it has been a long two months and I am still stuck. Disclaimer: You use my posts & wiki articles entirely at your own risk. Setup: Gigabyte GA-78LMT-S2P Phenom II 965 BE 6 Gb DDR3 1333 Ram R9 270x Everything looked good in the beginning, then the fans would spin and then turn off, now it doesn't seem to be turning on ; If Pin 4 is described as “Speed Control” or “PWM” or the like, you can be sure that the fan header supports PWM. The fans actually go crazy, spinning at full force. Unfortunately, the description of Pin 2 is not always a clear indication as some manufacturers use terms such as “Fan PWR” or “Power” for both types of fan headers. They are sold by the size in mm. There are a number of potential reasons for this problem, including mechanical as well as electrical. Now nothing will turn on. If it is controlled by the motherboard, you can open up the fan utility program and change the fan set points. Then when I restart, same thing! Fan on motherboard spins for a few seconds then stops, no boot. I also testing changing the speed in the controlled with the same result and finally I gave it a little push and it did spin a bit but after a couple mins it stopped. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. They normally always start spinning when i boot it up. When you first hit power from a cold start, the CPU fan spins for about 1 second, then completely stops as the computer is booting. Laptop users will need to test on a different computer. I've had the card for about a year with no problems. Same fan issue persisted. If your CPU fan is not spinning, then it is a matter of serious concern because if your CPU heatsink fan suddenly stops spinning, then it will lead to overheating of the CPU. I took out the power supply and tried it on another motherboard (without any other loads). Then one day, it went off suddenly and wouldn't boot any more: When I power it up, fans (CPU and chassis) start spinning for 15 seconds then they stop spinning. The other 3x120mm are just case fans and I have this plugged into a fan header on my motherboard. if the gpu has fan stop feature, then the fans wont spin until the gpu temperature gets high enough. Press Esc or F10 and select “save and Exit” press Enter and allow your system to restart then … To get these fans leds to work i have to cycle through the colours on the controller, then they'll stay on. My case fans unpredictably start and stop working. Page 1 of 3 - PC Wont Start, Fans Spin Then Stop, then repeats. Now every time the GPU temp hits 81-82 degrees the GPU fans spin up to 100% for a few seconds then back down to normal for a few seconds then … Fans start for one second and you can immediately hear them slowing down to a stop. Now it won't boot in the new case! When I press the start button, the light comes on. 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