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Rear case fan not working.

This is a discussion on Rear case fan not working. within the Motherboards, Bios & CPU forums, part of the Tech Support Forum category. I'm not sure if this is the right forum. But here goes. My rear case fan spins for a couple


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Old 06-16-2011, 06:39 PM   #1
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I'm not sure if this is the right forum. But here goes.

My rear case fan spins for a couple seconds on startup, then stops.

I can spin it with my finger and it goes smoothly. I've also tried unplugging it and plugging back in. It should work if it goes spins smoothly enough on startup, right?

Anyway to control my case fan?
If you need anymore info, ask and I'll try my best to answer.

Thanks.

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Old 06-16-2011, 06:41 PM   #2
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Post your PC specs.

Is the case fan connected to the motherboard or PSU?

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Old 06-16-2011, 06:45 PM   #3
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Wow, fast

Fan is connected to the motherboard i believe.

Specs:
Windows XP Home Edition Service Pack 3
NVIDIA GeForce 9800 GT
Intel(R) Core(TM)2 CPU E8400 @ 3.00GHz (2 CPUs)
3326MB RAM
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Old 06-16-2011, 06:48 PM   #4
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Sounds like time to replace it, they aren't expensive.
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Old 06-16-2011, 07:04 PM   #5
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Are you sure it has to be replaced? How are case fans operated? Are there bios I can download or something?
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Old 06-16-2011, 07:07 PM   #6
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No they are pretty up and down. If plugged in they either work or don't. It could be the plug on the motherboard but you would need a converter plug to plug it into psu instead to see if that makes a difference and the fact it spins when you do it by hand usually means the bearings are shot which is why I said to replace it.
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Old 06-16-2011, 07:08 PM   #7
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Alright, thank you.
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Old 06-17-2011, 10:04 PM   #8
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Ok, I just got a new fan installed.
Same problem.

The dude at the parts store said the case fan is supposed to come on during emergencies.
Well I'm pretty sure my computer restarting due to overheating constitutes an emergency.

Whats wrong? Is there no way to manually control my case fan? If there isn't a way, who's dumb idea was that?

This is really frustrating, help me.
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Old 06-17-2011, 10:21 PM   #9
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What motherboard are you using?
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Old 06-17-2011, 10:26 PM   #10
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How do I find that out? preferably without restarting my computer, as it takes like 1000 years to start.

Thanks.
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Old 06-17-2011, 10:30 PM   #11
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Is this an OEM pc? (Dell,HP,Gateway,etc) If so post the model number.

If custom built it will be labeled on the motherboard. You can use CPU-Z under the Mainboard tab.

Is there another fan header on the motherboard that you can use?
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Old 06-17-2011, 10:36 PM   #12
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Yes, its a Dell Vostro 400 desktop.

Motherboard-
Manufacturer: Dell inc
Model: 0RN474

And no, there aren't any other fan headers.
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Old 06-17-2011, 10:55 PM   #13
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You may have a problem with the fan header on the motherboard.

You can try using an adapter so that you can plug the fan directly to the PSU.
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Old 06-17-2011, 10:57 PM   #14
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The dude at the shop says that case fans only come on when needed?

When are case fans needed? and Is there a way to control them through bios or a program or something?
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Old 06-17-2011, 11:02 PM   #15
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You can check the options in the BIOS. Dell usually cripples the BIOS so there aren't alot of changes that can be made.

Has the fan always had this problem? Did you recently make any changes in the BIOS?

Most case fans will run from start (although at a lower rpm) and increase when the temp rises.
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Old 06-17-2011, 11:07 PM   #16
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Case fans that only come on when needed is NOT a true statement. Fans might spin slower if your CPU for instance is not under load and spin faster when it gets hotter, but with case fans it's either on or off due to malfunction or not plugged in or when temps get higher in the case. The best would be to buy an adaptor or a case fan that runs from the power supply via a Molex connector.
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Old 06-17-2011, 11:09 PM   #17
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I didn't make any changes to the bios.
My computer has been running hot for about a month now, and I couldn't figure out why.
Then just a couple days ago I noticed my case fan wasn't running. (It doesn't overheat and restart as long as I don't play any graphic intensive games.)

How do I go about changing bios settings?

Edit: Oh jeez, Johnny that kinda makes sense cuz I just got my new processor about a month ago. Thats when the trouble started.
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Old 06-18-2011, 12:25 AM   #18
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To get into the BIOS you press "Del" repeatedly before it goes into Windows. Post temps and voltages from there under hardware monitor or health status. If you can't get into BIOS try using HWMonitor and post temps and voltages for CPU as well. Have you got your case fan in the right fan header?
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Old 06-18-2011, 12:47 AM   #19
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I didn't get to look through my bios yet. I'm tired so I'll look at them when I wake up.

But, here is the HWMonitor stuff you wanted.
http://img844.imageshack.us/img844/9823/hwmon.jpg
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Old 06-18-2011, 12:58 AM   #20
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New problem, your Geforce 9800gt is running too hot if that was taken at idle. Please post if you're still using the OEM PSU (300w gathered from Dell website), if not Make/Model/Wattage attainable on the PSU's side panel. Could be that your PSU is underpowered for your system, hence the overheating. I'd recommend at least a good quality 650w Seasonic-made (XFX/Corsair/Seasonic) PSU for the 9800gt.

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