I changed the fan over but I still have the same problem. Tried turning on the PC again. Fan on motherboard spins for a few seconds then stops, no boot. If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. ... and that stopped the fans from running at a high rate. However, on further inspection, the fan spins a little then stops. The system won't boot further than this, ie: I don't have a chance to access the bios menu. I've built PCs in the past and stuff but I don't really want to open it up unless this is pretty much guaranteed to work as I do not want to void the cover on it for him but he has assignments due in very soon and needs access to itUPDATE: We opened it up and the 4 pin power connector was connected. Nothing appears on the screen, it just says "No signal". Then put the cable back into it and the original symptoms occured. I am in the process of building a computer and ran into a snag. Please remember to be considerate of other members. Change the CMOS battery and see if it works. :(0 comments. by longvue2. The fan spins for a second or two when first switched on but then switches off. If you only have one cpu and it doesn't boot either motherboard fully, you haven't eliminated the cpu. 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. A friend got a new computer and gave me his quad core which I was hoping to put into my system. Does the power supply need anything else plugged into the motherboard other than the 24 pin and 4 pin ATX cables? 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. Replaced CPU, cleaned off thermal compound and re-applied, reseated heatsink and CPU fan. ‘CPU Fan not Spinning’ is one of the worst problems that you can face in your computer. I got a Predator Helios 300 PH315 - 51 a month ago. When I go to hit power, the fans spin a second and then stop. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. Dec 26, 2013 12 0 10,510 0. And now I have tried a different power supply (one I know is OK) and it is doing the same thing. Same sypmtoms persist. 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. It's good to narrow it down.That was a great idea to check the voltage switch, but it was set at 115. No such thing on all my previous single processor machines. I recently found out that after experiencing high CPU temps, that my CPU fan was not spinning. 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. When turned on, it makes all the right noises etc and the fans start to spin up, then they start slowing down and just stop. 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. Good luck. 2 B. bmc Honorable. 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. 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. The EZCool is a fairly low-end unit, and may simply not be providing enough power on the 12v rail for consistent operation. I am in the process of building a computer and ran into a snag. Right, I have put the CPU back into the older PC that it came from and it boots fine, does this eliminate the CPU? Thanks for your help, but it has been a long two months and I am still stuck. Is it set to the correct line voltage?In the US, it should be set to 115/120.You can power up without the RAM installed and see if you get the no RAM POST beeps from the system.Without parts to swap, there is little else I can suggest you check.Chas. It continues try and spin … Then if I continue to hold the power button, a blue light begins flashing. The cpu fan starts for a second then stops. I then did remove the battery and the move the jumper to pins (2/3). LED green light comes on the mobo but the fan starts up for a few seconds then stops and the computer doesn't boot. 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). This conversation is currently closed to new comments. Experts Exchange always has the answer, or at the least points me in the correct direction! 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. 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. Thank you for the ideas. Both service and cpu fans spin briefly then stop.. then this repeats on and on. 100% Upvoted. The CPU fan spun like before but no beeps or anything. Our community of experts have been thoroughly vetted for their expertise and industry experience. I may not be understanding what you did - did you have a cpu from another system, and did you try that cpu in the Asus P5B motherboard (after resetting the BIOS)? P.S. Same sypmtoms - I replaced the service fan. report. 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. Our community of experts have been thoroughly vetted for their expertise and industry experience. When I go to hit power, the fans spin a second and then stop. the fans will spin for a second then stop. Remove all RAM and try it again. Below are the relevant specs: © 2021 ZDNET, A RED VENTURES COMPANY. The motherboard is an AM2+ system and the chip seemed to fit fine. I'm 99% sure it's something to do with the graphics card - I had tried adjusting it to make sure it was sitting right and then it suddenly booted fine, but then started turning off again after I rebooted. Understanding Bash: A guide for Linux administrators, Checklist: Managing and troubleshooting iOS devices. I have tried unplugging the PSU and holding power for 30 seconds and that didn’t work. I scrounged up a good PSU from someone and it did the same thing. Fans spin for half a second and then turn off. Removed CPU heatsink and CPU to check pins: all pins look fine, CPU looks fine and installed correctly, etc. 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. For a while I've been using a dual core processor. 11 years ago In reply to Push start button, fan ru ... Hi Tyler, i have the same problem. There is no beep however, and no video. We've partnered with two important charities to provide clean water and computer science education to those who need it most. So you have a cpu that used to work fine, but now is intermittently working on the same motherboard where it used to work (you reset the CMOS after reinstalling it, right?). I tested the PSU with the paperclip method, the fan runs continuously. READ MORE. All the case fans still spin and the computer continues to run for a few min then over heats and quits. You need to be meticulous about reinstalling, to make sure the cpu is flush against the socket and all connections are snug. I am setting up a new machine tonight with the same processor and had the same exact problem. The fans actually go crazy, spinning at full force. Computer Building: 3: Oct 28, 2020: J: Question Windows Starts Inconsistently, All fans stop when Windows loads then starts up again. Since, then my computer won’t post. I tested the PSU with a purchased PSU tester. There are many results if you search for that string which focus on memory issues. Notice the CPU fan spins for half a second and stops. ALL RIGHTS RESERVED. If it's the CPU fan we have to think about those little speed control boards or just let it run at full speed. It will spin for 5 seconds, stop for a 1 second, and then spin again for 5 seconds. So I tried to restart the pc without the chipset fan attached, the CPU fan spun a half second then stopped. Thanks. Connect with Certified Experts to gain insight and support on specific technology challenges including: We help IT Professionals succeed at work. The memory was also removed and each piece was tried in each slot. Thanks, your right, it was that. Removing the MOBO from the chassis and applying power would confirm this. Experts with Gold status have received one of our highest-level Expert Awards, which recognize experts for their valuable contributions. Hi, so I recently finished a PC build and I went to power it on the fans spun, but no startup. CPU fans got loud noise like spin very fast? If still no luck then the power supply is the most likely suspect and then the MOBO. The CPU fan spins for 2-3 sec and then stops and then spins again - repeatedly. We're trying to determine if the new P4 3.4 cpu is at fault. Being involved with EE helped me to grow personally and professionally. With everything plugged in correctly, the PWM fan would spin for a second and then stop. Please note: Do not post advertisements, offensive material, profanity, or personal attacks. CPU fan spins for a second and stops. I removed it and everything booted up but no visual display or seemingly no activity. After I installed it and turned my computer on however the CPU fan spun for a brief moment then stopped and the system didn't boot. When asked, what has been your best career decision? I unplugged all cables from the motherboard and all power cables from fans, HD, CDROM. I think you have a bad motherboard. Now when the computer starts up the Heatsink fan spins for 2 seconds and stops. Thanks for all your help. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. After about 40 seconds or so, the mobo would start continuous short beeps over and over. - I dusted the case, (it was not that bad anyway). New build, fans spin for a sec, shuts off! 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. This award recognizes tech experts who passionately share their knowledge with the community and go the extra mile with helpful contributions. by longvue2. You can make sure that the system isn't too loud, with the fan only spinning up faster when your PC gets warm. If it's clean from dust, the fan is in good shape and you're still having this problem then unplug the fan from the motherboard, close the panel and start the computer up. Fan on motherboard spins for a few seconds then stops, no boot. hide. Rechecked the cables and plugs a million times, cleaned off the CPU and fan… OK, I only have one CPU (the Pentium 4 3.5 GHz (model 550)). Why do my CPU and case fans spin but no startup? It did for me. I also tried another PSU. If you're new to the TechRepublic Forums, please read our TechRepublic Forums FAQ. Then a blinking blue light comes on. Does the same thing, CPU fan spins for half a second and stops. All submitted content is subject to our Terms Of Use. 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. (Unlock this solution with a 7-day Free Trial). I thought I have ruled out everything, so I am a little lost. It might sound a little strange but it helped me. Microphone Only Picking Up Output Sounds (Desktop Audio). Thread starter bmc; Start date Jan 3, 2014; ... fans spin up, fans power down, all within maybe 2-3 seconds. I removed all of the chassis cables except the power switch and tried to flip it in case it was in backwards. OK, so now I have moved the memory and the CPU to another motherboard (Asus P5LD2-VM DH) - this has onboard graphics. Thinking it was the fan itself, I got a replacement fan and swapped it out. Computer Building: 1: Oct 8, 2020: R: Question Monitor went blank while playing a game. Once it realizes what the temp is it stops spinning because there is no heat or not enough heat for the fans to spin. Waited , then back to pins 1/2 and replaced the battery. Or were some standoffs shorting the power supply?? Remove all power to hard drives and Blu-ray drive. The PSU tester shows everything as good. The OS continues to load and the laptop runs OK for a while but then shuts down due to overheating. Is it stops spinning because there is no beep however, and may simply not recognized! When i go to hit power, the MOBO? if you only have one CPU the. 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