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Case fan problem, need help please.

#1EliteGuard99Posted 8/18/2014 1:05:42 PM
My rear system fan doesn't spin, but all the others do. The system fan on the MB has 4 prongs, but the cable for the rear system fan only has 3.

Am I doing something wrong or am I missing a part?
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Halo 5: We copied even more **** from CoD this time edition confirmed.-Charocks
The king of the monsters returns! - 5/16/2014
#2EliteGuard99(Topic Creator)Posted 8/18/2014 1:38:38 PM
Please anyone?
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Halo 5: We copied even more **** from CoD this time edition confirmed.-Charocks
The king of the monsters returns! - 5/16/2014
#3Lord_VaderPosted 8/18/2014 1:44:43 PM
I think I had a similar problem to yours: http://www.gamefaqs.com/boards/916373-pc/69868425

Are your fans connected to the motherboard? You should connect them to the PSU. In your case you also need a 4 pin to 3 pin adapter which is the part you seem to be missing. I got mine at microcenter. This was the one I got: http://www.microcenter.com/product/260711/Power_Supply_4-pin_to_3-pin_Fan_Adapter
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Live long and prosper.
#4SnadadosPosted 8/18/2014 1:47:34 PM
You can use a 3 pin fan on a 4 pin fan port. The 4th pin is for PWM fans that let the motherboard read and control their speed.
Plugging a 3 pin into a 4 pin slot just means the fan will run at full speed.

Do some troubleshooting.
Try the fan that isn't working on different fan ports on your motherboard.
Try different fans on that 4 pin port your rear fan is connected to.
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Have you accepted Raspberyl as your loli and savior?
#5KillerTrufflePosted 8/18/2014 1:54:34 PM
You can still use the 3-pin power adapter with the 4-pin fan, as long as they're both the same pin size. If the fan is molex, you'll need either an adapter or a fan controller that supports molex, or you'll need to plug it directly into the PSU, which means it'll always run at full speed.

Otherwise, the 4th pin on the fan isn't necessary. I suspect it would be a PWM plug, and the 4th pin is simply used to control the fan speed. You may actually be able to find a motherboard header to plug it into.

Assuming your fan's plug looks like this:

http://www.kenable.co.uk/images/k-pmw-fan-ext-30cm.jpg


See if your motherboard has something like this, but that says "Case fan" or similar.

http://www.pcstats.com/articleimages/200801/LGA775install_pwm.jpg


Alternatively, you can just use the 3-pin cable you talked about with the 4-pin fan plug, as long as you identify "pin 1" on both and match them up. Pin 4 on the PWM (4-pin) plug is what controls fan speed, and isn't necessary to run the fan.

http://www.jobcyclone.com/company/pcservices/cpu_fan/image003.jpg


If your fan is molex tho, you'll need to either adapt it down, or connect it to your PSU or a fan controller.

http://upload.wikimedia.org/wikipedia/commons/3/31/Molex_female_connector.jpg
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"How do I get rid of a Trojan Horse?" -Sailor_Kakashi
"Leave it outside the gates of Troy overnight." -Davel23
#6EliteGuard99(Topic Creator)Posted 8/18/2014 2:29:14 PM
Ok thanks guys, I'll just buy the cable.
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Halo 5: We copied even more **** from CoD this time edition confirmed.-Charocks
The king of the monsters returns! - 5/16/2014
#7KillerTrufflePosted 8/18/2014 2:43:56 PM
Depending on what it's plugged into, it's possible for a 3-pin power supply to control speed of a 4-pin fan still, using the old-school method of simple voltage adjustment. Lower voltage = lower speed. Some fan controllers work this way.
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"How do I get rid of a Trojan Horse?" -Sailor_Kakashi
"Leave it outside the gates of Troy overnight." -Davel23
#8EliteGuard99(Topic Creator)Posted 8/18/2014 2:46:02 PM
While we are here, I have my new computer hooked up to my tv via an HDMI port, and I get picture but no sound what am I doing wrong? I use windows 8.1
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Halo 5: We copied even more **** from CoD this time edition confirmed.-Charocks
The king of the monsters returns! - 5/16/2014
#9KillerTrufflePosted 8/18/2014 3:15:53 PM
Most video cards don't transmit sound over HDMI without a bit of setup first (and some can't do it at all).

First, if your GPU supports sound over HDMI at all, it may have an internal SPDIF connector that has to be plugged into your sound card's (or motherboard's) SPDIF header. This gives you an idea what you're looking for:

http://www.hardwaresecrets.com/article/How-to-Use-The-SPDIF-Connector-Available-on-GeForce-Video-Cards/600/2

Once that's done, or if your GPU doesn't require that, you'll need to go into your output settings in your Windows volume control and switch your sound output device to your GPU and/or HDMI.

If your GPU doesn't support sound over HDMI at all, it just won't be an option.
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"How do I get rid of a Trojan Horse?" -Sailor_Kakashi
"Leave it outside the gates of Troy overnight." -Davel23