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New build, cpu or cpu fan is not working

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October 12, 2012 12:14:12 PM

Hello everybody, I just built my computer finally. But when i turn on my computer for the first time, everything but the cpu fan is up and running. I checked, all the fans are moving, my video card fan is moving, so i know my motherboard is working. I turn on my computer and in half a second my computer just turns back off. I see my cpu fan budge for less then an inch but then just stops. What has happened :o !
October 12, 2012 12:20:05 PM

btw i am using the stock fan.
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October 12, 2012 12:40:20 PM

What are your computer specs? Does your PSU have enough juice to run all your components? Is the CPU fan plugged into the MB cpu fan connector or one of the system fan connectors? It could be that you got a bad fan to begin with but that is rare.
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October 12, 2012 12:43:16 PM

Post your specs!
Double check fan is connected to the CPU fan riser on the mobo, and that none of the sockets on the fan power lead are damaged. Also check all the connections on the front panel riser are correct. If nothing found, consider removing your mobo from case and set it up on a breadboard, starting with just CPU, memory stick then see if fan runs. Add further items . If it runs OK look for possible short ccts from extra standoffs etc.
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October 12, 2012 12:43:58 PM

bcarlo25 said:
What are your computer specs? Does your PSU have enough juice to run all your components? Is the CPU fan plugged into the MB cpu fan connector or one of the system fan connectors? It could be that you got a bad fan to begin with but that is rare.


this is my build
PCPartPicker part list: http://pcpartpicker.com/p/jyuu
Price breakdown by merchant: http://pcpartpicker.com/p/jyuu/by_merchant/
Benchmarks: http://pcpartpicker.com/p/jyuu/benchmarks/

CPU: Intel Core i5-3570 3.4GHz Quad-Core Processor ($214.98 @ NCIX US)
Motherboard: MSI B75MA-P45 Micro ATX LGA1155 Motherboard ($69.99 @ Amazon)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory ($39.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($80.75 @ NCIX US)
Video Card: HIS Radeon HD 7870 2GB Video Card ($234.99 @ Newegg)
Case: Cougar Challenger-B (Black) ATX Mid Tower Case ($95.98 @ Newegg)
Power Supply: XFX 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($79.98 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($24.98 @ Newegg)
Monitor: Acer S211HLbd 21.5" Monitor ($119.99 @ Newegg)
Keyboard: Microsoft SIDEWINDER X4 Wired Gaming Keyboard ($49.99 @ Newegg)
Total: $1011.62
(Prices include shipping, taxes, and discounts when available.)

I'm starting to think that my fan is faulty, i plugged in my old pc's cpu fan into my new one and it worked! but it turned off also
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October 12, 2012 1:26:14 PM

Have you plugged the mini power connector into the mobo (4 pin square one)
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October 12, 2012 1:27:21 PM

Also, unwind the fan cable from around the stock cooler, its clipped in, this may be stopping the fan from turning.
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October 12, 2012 1:42:00 PM

See if you can find a converter to convert the 3-4 pin fan header to a 4 pin molex connector and plug it directly into your PSU if it works then you know it is a power issue with the motherboard. Also try connecting it to a system fan connector on the MB and see if it runs.
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October 12, 2012 1:51:28 PM

da22 is correct about checking the 4 pin CPU power connector. On your board it doesn't look like it's marked very well. It's up and to the left of the CPU and marked JPWR2.
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October 12, 2012 1:55:28 PM

I have the same mobo as you and I can tell you that my 4pin power connector fell out when moving the pc, make sure it clicks in!

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October 12, 2012 10:43:56 PM

Best answer selected by gambitd.
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October 13, 2012 8:41:51 AM

This topic has been closed by MouseMonkey
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