Fan Issue Tags: Cooler Master LED Monitor Components Last response: December 29, 2012 12:51 PM in Components Share Chaos Water December 29, 2012 7:03:48 AM I've got this strange issue with my case fans, when my computer boots onto the desktop for a split second all my fans slow right down then speed back up again. Here's all my case fans I have at the moment if this helps 4 Arctic F12 120MM (2 intake/2 exhaust) 1 CiT LED 120MM (intake) 1 Coolermaster 120MM (exhaust) 1 Coolermaster 120MM LED (intake) If it helps here are my system specifications OS - Windows 7 Ultimate 64bit CPU - AMD FX 8150 3.6GHz (AM3) GPU - Sapphire Radeon HD 6850 1GB + XFX Radeon 6850 1GB (Crossfire) RAM - 4 X 2GB Kingston HyperX Blu DDR3 PSU - Coolermaster GX650W Case - Coolermaster CM690 II Lite Monitor - Acer 23" HD 1080 3D LED Monitor Keyboard + Mouse - Aula (Chinese make) Is this normal or is there something not right? More about : fan issue User4798 December 29, 2012 7:30:46 AM if its just a split second then its fine even my pc did that. what motherboard do you have? knuckleonAMD December 29, 2012 7:31:14 AM Do you have any software that controls the fan rpms. Like Speedfan, or an overclocking utility if so it might be the program taking control of the fans. Probably nothing to worry about. Related resources CPU fan attachment issue - Forum cpu fan cooler/heatsink issue - Forum GPU Fan Issue? - Forum 3 pin fan issue - Forum Sapphire Radeon 7790 2GB OC fan issue - Forum Can't find your answer ? Ask ! Get the answer Chaos Water December 29, 2012 7:57:49 AM No software controlling the fans, nothing has been modified in BIOS either, I have an ASUS Sabertooth 990FX motherboard. User4798 December 29, 2012 9:04:54 AM I wouldn't worry about it. My old pc used to do it and it was fine also are the fans plugged into the mobo or Psu? Chaos Water December 29, 2012 12:51:31 PM All fans run directly to the motherboard and plugged in via the 3 pin connector. Can't find your answer ? Ask ! Publish Related resources SolvedAMD FX-8320 Overheating, possibly an issue with the fan RPM Forum SolvedReplacing PSU; Fan Size an Issue? Forum SolvedCooling Power Issue: Fan doesnt start up with PC until i give it a nudge Forum SolvedMoved Parts into HAF X- temp/fan issue. Forum SolvedNoctua NH-D14 fan noise issue. Forum SolvedPhantom 410 fan controller issue? Forum SolvedMobo SYS_Fan Issue/CPU temperature Forum SolvedMotherboard CPU fan issue Forum SolvedTemperature and fan issue. GTX 770 Forum Solvedfan rpm issue Forum SolvedCPU fan issue Forum SolvedVGA fan issue Forum SolvedCorsair H100i Fan control issue Forum SolvedPuzzling Issue with Heatsink Fan Forum SolvedGPU fan gets loud? not an over heating issue? Forum More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !