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Computer will not turn on, the fan kicks on and then nothing the fan keeps running

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Check your num lock is on off when u press num lovk key.if it on /and off then your ram is ok other wise u have to refix your ram.
clean dust from it and refix again in its slot.
reset your bios put your cmos cell flr 15 minutes then refix it.bios is reset then.
then check u get any display.
also disconnect all cables then reconnect.
check your power supply and earthing.
followthis step by step.

Posted on Nov 15, 2008

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Fan Cycles on and Off


Hi Justin,
The fan in your PC is operated by a thermostat. When it detects a rising temperature, it powers up the fan to blow cool air in - and hot air out. A PC that is overheated will produce unexpected results and can fail permanently.
When your PC is doing nothing - or idling, very little heat is generated by the processor, video card, network interface, etc. so fan forced cooling my not be needed. When you start to do things with it - then things begin to heat up. the processor, video, network, memory, USB, sound card, etc. all do work and generate heat that needs to be removed from the case.
You should make sure that all ventilation holes, slots, etc. are free and open - if any are blocked, it will cause the fan to turn on more often and run longer. The fan will run more often & longer when the room the PC is in - is 80 degrees than when the room is 65 degrees. Make sure the PC isn't boxed in a cubby that prevents air flow. Vacuum / blow out the insides of the PC & power supply regularly - dust build up insulates parts keeping them warm (disconnect / unplug before attempting).
Preventing the fan from doing it's job will shorten the life of the PC.
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Why does my computer keep restarting?


It's either running hot, you have a device conflict or a virus.

Try running a virus scan to make sure it's not kicking you off. Check your devices in the device manager to make sure all drivers are loaded.

Remove the power cord, remove the case, take a can of compressed air and blow out the dust from inside the computer, around the vents, around the fans.

If it still runs hot after the above steps, remove the fan that is on top of the CPU and Heat Sink. Clean the dust and apply a fresh coat of Thermal Paste to the CPU and Heat Sink.

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We refresh computers for ING and just got in around 50 M90 desktop computers. When turned on, the fans on ten of those computers run loud and never kick down. I've never experienced this issue with...


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Then, because the fans are temperature-sensitive, they should slow-down to a much-quieter level.

Easy solution: enter BIOS SETUP, and you can configure whether this "slow-down" happens, or does not happen.

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1 Answer

I have a question about why the fan keeps going on when i log on to the computer. Also when it is running an access query?


The fans on a computer are tied to thermometers that measure your internal case or component temperature. 

Heat Kills Computers.

So when you're running a query, or "search" or anything else that spins up your hard drive platters, you're generating heat, so the fans kick on to dissipate that heat. Plenty of other things will also cause heat to build up, but hard drives themselves generate quite a bit, also your processor which is only about the size of your fingernail, would melt/fry without the baseball sized heat sink and fan that is clamped down onto it.



There are ways around this, and one could go on to describe them, but turning your fans off is a terrible idea.

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what u may have done is wwhen u were installing the new board, gave a static shock to the system...that will cause only the fans to come on and nothing more...this is a bad problem bc u cannot fix it...if u figure out something else is wrong, and it gets fixed, let me know

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Your fan is supposed to run on your computer all the time. If it does not, it will overheat and cause expensive damage.

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