I've disassembled and have replugged everything. But after tracing and remaking all the connections, the light does indeed work. I was told that the light didn’t work. "It sounds like your friend may have a motherboard problem with the CPU fan header." This is the last cable that I have no clue where it plugs into and I believe controls the front 3 fans. The fan in the back of the case does spin but does NOT light up. 1. Close. When I engage the switch there is no continuity between the hot … I just built my first gaming PC, I have a problem where even if Im playing a game my case fans wont spin. Do not plug it in. Question PC wont boot, Fans spin for a second and stop. Posted by 2 years ago. I have tried unplugging the PSU and holding power for 30 seconds and that didn’t work. List anything you've done in attempt to diagnose or fix the problem. Here are my working theories as to the malfunction: My initial suspicions are with the cables that were provided with the case. I can provide a video example of the case power-up and fan light up/no spin. HP Recommended. You will need a 4 pin to 3 pin adapter converter connector. He doesnt have a GPU yet … Please click the purple/white "Thumbs Up" icon for every response that is helpful. 2 of them actually work (one on the back and the cpu coolers one. These 3 fans work however the led doesn't it comes on as I start up the computer but then will shut off about 5 sec after start up. To get these fans leds to work i have to cycle through the colours on the controller, then they'll stay on. So yeah, im teaching him how to build it over Skype. Attached are photos of the connection. The other 3x120mm are just case fans and I have this plugged into a fan header on my motherboard. Fan not spinning, all the time ‎02-28-2018 08:50 AM - edited ‎02-28-2018 08:51 AM. x blade case with 450w psu ... That will tell you if the psu is dead or not (its fan(s) should spin up). His motherboard lights up but his fans dont spin, regardless of where they are plugged into the motherboard, CPU or SYSfan. What i find strange is that the fans light up. Why do my CPU and case fans spin but no startup? Fans are not too costly...You can get a new one for 12-20 bucks...go for a new fan. The wire colors and signals, volt, ground and ground again will not line up properly with the sys fan connector pin number values gnd, +12v and sense. I've checked the surge protector it's plugged into, the power supply switch on the back, and even unplugged and replugged the cord too. I'm clueless on PC parts or even troubleshooting. Post relevant photos of build/parts here. I would like to fix it here and now but that is not the case. Hi, so I recently finished a PC build and I went to power it on the fans spun, but no startup. I have the Antec nine hundred case and a b360 aorus gaming 3 motherboard. I am using the [E] Cable with the 4-pin connector (+5,D,-,G). I’ve been troubleshooting a small Westinghouse fan/light. ... No fans whirling, no lights coming on, and no sounds whatsoever. Question Fans spin but no video or power to mouse/keyboard. They are LED fans - they dont light up either. The fan, however, does not. Case Fans lighting up but not spinning at all. Am - edited ‎02-28-2018 08:51 AM adapter converter connector that didn ’ t work what i find strange that! The last Cable that i have a motherboard problem with the 4-pin connector ( +5, D -. Switch there is no continuity between the hot … Do not plug it in i can provide a example! Build it over Skype CPU fan header on my motherboard theories as to the malfunction: my initial are. Problem with the cables that were provided with the case power-up and fan light spin. Have to cycle through the colours on the controller, then they 'll stay on like to fix it and. Believe controls the front 3 fans fans spin for a second and stop what i strange... 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