http://www.californiahosting.net/4-pin-motherboard-fan-connector/
4 Pin Motherboard Fan Connector
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Motherboards – ASUS – P4B266-C 256/400/ Socket 478 $0.01 |
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Dell Insp 5150 Motherboard & CPU Broken Power socket $0.01 |
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PC DIAGNOSTIC 4-Digit CARD Motherboard POST Teste $0.01 |
Built PC – Won’t power on with 4-pin +12 volt power connector plugged in to motherboard?
This is new to me – I built a PC and plugged in all connectors and my system wouldn’t turn on. I noticed it powered on the fan and power supply for less than 1 second then turned off. I got the same result with a different power supply.
Then as I was using my power supply tester I noticed the power supply didn’t work, but it did work when I unplugged the 4-pin 12-volt power connector going to the motherboard. After I unplugged the 4-pin connector all is well. The system turns on, bios indicate fans and temp are good, cpu running at the right speed, it boots up, no problem.
Any Ideas as to why this is happening?
My system –
Intel Celeron D 360 3.46ghz, socket 775 cpu
Mach Speed P4MSD-800D2 Motherboard
512 MB Ram
550 watt power supply
Sounds very much like a short. If you have access to a storage oscilloscope you can find out which of the power lines isn’t coming up.
Another alternative is that the power supply is bad and simply can’t take the load once it is plugged in.
If you don’t have a scope:
- Reseat everything!
- Find another power supply to try.
- Replace the motherboard.
Come to think of it, you have pushed the soft power-on button? Some motherboards can be configured to not turn on when power is applied. They require the soft power button to be pushed.
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IBM R32 Type 2658 Motherboard, Base + for Parts/Repair $0.01 |
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HP Compaq F500 F700 Motherboard 442875-001 Parts Repair $0.01 |
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Video Review #7 – MassCool 80mm Case fan (No LEDS)
