The PSU tester shows everything as good. P.S. I changed the fan over but I still have the same problem. When I go to hit power, the fans spin a second and then stop. This is rare, but if moving the cpu causes the problem to move, it points to the cpu as the cause. I recently found out that after experiencing high CPU temps, that my CPU fan was not spinning. :(0 comments. My search for an answer led me here, but this was a dead end. Gain unlimited access to on-demand training courses with an Experts Exchange subscription. It did lead me to realize it was a power problem so I reread my power manual and 45 frustrating minutes later I found that there is an extra 4 pin power connector next to the processor on the mb! Some standoffs need insulating washers to prevent shorting and would go on the underside of the board. Waited , then back to pins 1/2 and replaced the battery. on ... Also I assume your talking about the CPU fan correct? Hi, so I recently finished a PC build and I went to power it on the fans spun, but no startup. They spin only when they need to, when you boot the computer it doesn't have a temp reading yet, so it will start at full speed. Tried turning on the PC 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. The fan spins for a second or two when first switched on but then switches off. I have attempted to unplug everything except the CPU and RAM from the motherboard (I did leave in the CPU power cable, the front power switch, the heat sink, and the CPU fan cable). I am in the process of building a computer and ran into a snag. Dec 26, 2013 12 0 10,510 0. report. New build, fans spin for a sec, shuts off! OK, so now I have moved the memory and the CPU to another motherboard (Asus P5LD2-VM DH) - this has onboard graphics. There are many results if you search for that string which focus on memory issues. > a colleague has confessed that he fried the P5LD2 last week, https://www.experts-exchange.com/questions/22061341/CPU-fan-spins-for-one-second-and-then-stops.html, https://www.experts-exchange.com/Hardware/Desktops/Q_22060296.html#17942625. Being involved with EE helped me to grow personally and professionally. This award recognizes tech experts who passionately share their knowledge with the community and go the extra mile with helpful contributions. It is like having another employee that is extremely experienced. 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. Thanks. OK, I only have one CPU (the Pentium 4 3.5 GHz (model 550)). This conversation is currently closed to new comments. The EZCool is a fairly low-end unit, and may simply not be providing enough power on the 12v rail for consistent operation. Please remember to be considerate of other members. Now when the computer starts up the Heatsink fan spins for 2 seconds and stops. Nothing appears on the screen, it just says "No signal". hide. Rechecked the cables and plugs a million times, cleaned off the CPU and fan… The second best is to try a different power supply.I assume that the clear CMOS jumper is in the "Normal" position.Check the AC mains switch on the power supply near where the line cord plugs in. It might sound a little strange but it helped me. Same sypmtoms - I replaced the service fan. Then a blinking blue light comes on. The OS continues to load and the laptop runs OK for a while but then shuts down due to overheating. Below are the relevant specs: © 2021 ZDNET, A RED VENTURES COMPANY. New workstation, fans spin for about 1 second then nothing - posted in System Building and Upgrading: Hi all and thank you once again for your precious replies. Good luck. I am going to assume it is either the MOBO or the CPU (my guess from both of the comments I received is that it is the MOBO and I'll see if I can send it back. You need to be meticulous about reinstalling, to make sure the cpu is flush against the socket and all connections are snug. LED green light comes on the mobo but the fan starts up for a few seconds then stops and the computer doesn't boot. If it's the CPU fan we have to think about those little speed control boards or just let it run at full speed. I tested it outside the case, I tried a switch from an older computer, I took everything out that wasn't needed, I switched my custom CPU fan with the stock Intel. Controlling the CPU fan speed in your PC (or all the fans, in fact) is a way to give you more control over your Windows 10 experience. I performed the bench test on a cardboard box with the bare minimum components – CPU, stock fan and PSU connected to the motherboard, still no POST. You can make sure that the system isn't too loud, with the fan only spinning up faster when your PC gets warm. this action keeps repeating. ‘CPU Fan not Spinning’ is one of the worst problems that you can face in your computer. Thank you for the ideas. I then turned the computer on by shorting the power jumpers. With the ATX12V Plug disconnected, the CPU fan spins up fine and stays spinning, but the GFX card's fan does not spin, assuming the card isn't actually getting power here. Thanks for your help, but it has been a long two months and I am still stuck. Move the other cpu to this motherboard and see if that works. My computer was working fine, put it to sleep for an hour came back and it wouldn't start. A bare system with RAM and a video card should POST and display the BIOS. I tested the PSU with a purchased PSU tester. Thanks for the idea, I took the motherboard out of the case and it still would not start. Thanks for all your help. the fans will spin for a second then stop. Right, I have put the CPU back into the older PC that it came from and it boots fine, does this eliminate the CPU? I feel like such a dunce! The previous post was right, if you dont plug in the 4 pin cable from the power supply it does start the fan and stop.These 4 pin come with some Antec power supplies. I plugged it in and all is well. Now, when I first booted up the PC the CPU fan started spinning and all seemed happy (hence me awarding the points on the other question) - until I installed the graphics card - then the problem returned. I pushed on the Ram sticks and still wont work.. that same computer guy now said it was the PSU gone so he connected up a new PSU and the exact same problem happened.. so he said my motherboard is screwed and to buy a new PC from him. We've partnered with two important charities to provide clean water and computer science education to those who need it most. The Chipset fan was basically siezed. I then did remove the battery and the move the jumper to pins (2/3). The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. When I go to hit power, the fans spin a second and then stop. My friend is having this problem of the power button lighting and the fans turning for a couple of seconds then nothing happening then it tries it again then it stops completely but it was working fully before hand. No such thing on all my previous single processor machines. Get a good Seasonic 600w (or even their new 700w unit). If you only have one cpu and it doesn't boot either motherboard fully, you haven't eliminated the cpu. All submitted content is subject to our Terms Of Use. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. Here is what is happening.When you press the power switch, the motherboard sends a signal to the power supply to turn on.As the voltages come up, additional circuitry on the motherboard and in the power supply check to see if the voltages are within specified limits.If all is good, the power good line changes state and the power supply keeps running.You have the power starting up, but no power good signal.The best thing to do, is use a power supply tester to verify that the power supply is good. And now I have tried a different power supply (one I know is OK) and it is doing the same thing. Understanding Bash: A guide for Linux administrators, Checklist: Managing and troubleshooting iOS devices. Yes, it was working prior to me building the new PC - today I have put the CPU back in the old PC and verified that it boots correctly. Thanks, your right, it was that. After about 40 seconds or so, the mobo would start continuous short beeps over and over. Since, then my computer won’t post. I've got an Acer Aspire 5332 laptop in for repair. With everything plugged in correctly, the PWM fan would spin for a second and then stop. I have returned the CPU and the Motherboard, both are new. READ MORE. I removed all of the chassis cables except the power switch and tried to flip it in case it was in backwards. Notice the CPU fan spins for half a second and stops. The motherboard is an AM2+ system and the chip seemed to fit fine. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended. Our community of experts have been thoroughly vetted for their expertise and industry experience. Change the CMOS battery and see if it works. I also tried without the RAM and it still did the same.The CMOS is in the normal position and I am wondering if maybe I should get a new battery to make sure.I am guessing it is down to the MOBO or the CPU.Thanks again for your quick reply, your help is appreciated. For a while I've been using a dual core processor. PS I have given up on the P5B for now as it doesn't have on board graphics - I want to try and get it working on the P5LD2 first which does. Replaced CPU, cleaned off thermal compound and re-applied, reseated heatsink and CPU fan. When asked, what has been your best career decision? Please note: Do not post advertisements, offensive material, profanity, or personal attacks. The previous post garnered expert advice, so I am hoping someone will have some idea on what I can do. how to redirect internet via rasberry pi. So I tried to restart the pc without the chipset fan attached, the CPU fan spun a half second then stopped. Alright, so I have an AMD system. If still no luck then the power supply is the most likely suspect and then the MOBO. Does the same thing, CPU fan spins for half a second and stops. Fan on motherboard spins for a few seconds then stops, no boot. The system won't boot further than this, ie: I don't have a chance to access the bios menu. Then put the cable back into it and the original symptoms occured. Were any providing a ground to the MOBO? min then over heats quits! Our community of experts have been thoroughly vetted for their expertise and industry experience i then turned the on... Is at fault, then my computer was working fine, put it to for. Applying power would confirm this but no startup TechRepublic Forums FAQ helpful contributions continues run. Spin very fast: R: Question Monitor went blank while playing a game paperclip method, the fan. When asked, what has been a long two months and i removed the motherboard when. 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