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Plugging in 4 pin cpu fan a must?

post #1 of 11
Thread Starter 
I'm wondering you you HAVE to plug in the 4 pin connector for the cpu fan in order for the psu to turn on. I currently have my newer psu connected to an older computer without the 4 pin cpu fan connector. For some reason the fan doesn't run and I'm not getting any lights. I know the psu isn't dead because it was working fine. I just decided to upgrade it to a 500W unit. Any ideas?
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post #2 of 11
no, you don't have to. you'll probably get a warning message from the BIOS if you boot without a CPU fan plugged in, but that's it.
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post #3 of 11
yeah, mines not plugged in i just get a warnin message tho
post #4 of 11
Thread Starter 
hmmm That's weird....It's not that I don't have a psu fan plugged in. Its just that my other computer has an older board that doesn't use the 4 pin from the mobo. There is no sign that the psu is powering up at all.
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post #5 of 11
do they speak French in Toronto? i'm having trouble understanding you. you're talking about plugging your PSU fan in, which makes no sense at all. are you talking about the little 4-pin power connector that some CPU fans have or are you talking about the bigger 4-pin connector that goes from your PSU to your motherboard?
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post #6 of 11
Some PSUs have a fan RPM monitor that you can plug into your motherboard.... are you talking about that?
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post #7 of 11
Thread Starter 
Okay let my clarify. The newer mobos take a 4 pin square connector that goes from the psu into the mobo to power the cpu fan. The cpu fan then connects to a 3 pin connector on your mobo to run it. I'm taking about that first connector. Does that have to be plugged into the motherboard in order for the psu to run? I have a cpu fan connected to the motherboard but it doesn't need the plug hence it is not plugged in. The psu has worked before and I am pretty sure it still works since I've kept it in a plastic bag in a box and it has not been moved/damaged at all. It was in perfect working condition when I put it in.
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post #8 of 11
Thread Starter 
*bump* =P
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post #9 of 11
No need for the other pin

3pin is fine
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post #10 of 11
he's talking about his CPU power connector. the 4-pin ATX connector. it has nothing to do with your CPU fan. i didn't know if they needed to be connected or not, but apparently they do. you can probably use a paperclip to jump one of the black wires to a yellow wire to make it work? don't try it based on what i just said. i've never actually done it before. it should work in theory though.
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The C'roe
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