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PC wont power up - 4 pin ATX 12V cable when connected stops fans

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  • Power Supplies
  • Connection
  • Components
Last response: in Components
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March 9, 2011 8:12:44 PM

Hello,
After 15 months use my PC wont pwer up. I checked the power supply by shorting the green/black pins and the fan turns on. I connected the PS back to the MOBO (using 24 pin connection) and the CPU fan also turns on. As soon as i connect the 4 pin 12V supply cable none of the fans work. I have all the Hard drives, disk drive disconnected btw. Any ideas why the power is lost when the 12V/4pin connector is added?

More about : wont power pin atx 12v cable connected stops fans

a c 722 ) Power supply
March 9, 2011 8:35:38 PM

Maybe bad motherboard.
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March 9, 2011 9:05:30 PM

maybe its a bad rail, try buying a 4 pin molex adapter and see if it works off of a different rail. good luck!
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Related resources
a c 297 ) Power supply
March 9, 2011 9:09:30 PM

Without the 4 pin 12V connector the CPU has no power so BIOS cannot make it past very basic functionality like sending power to fans. Post your full system specs then go through the boot checklist, it should help solve the issue.
http://www.tomshardware.com/forum/261145-31-perform-ste...
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a c 94 ) Power supply
March 10, 2011 2:49:04 AM

When this happened to me replacing the motherboard brought my PC back to life. I'm going with Rolli on this.
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!