Depending on the type of nose, that could be fan bearings as opposed to air
rushing through the heatsink and fan. Bad fan bearings have a metallic
rattle or chatter to them that the whoosh of moving air does not. If you are
hearing bearing noise, it might be a good idea to replace the fan with one
that has fresh bearings.

Kenneth Whyman
[log in to unmask]
Chance favors the prepared mind.


On Sun, Feb 15, 2009 at 8:25 PM, aung-maw <[log in to unmask]> wrote:

> Dear Kenneth,
>
> After replacing new Motherboard, it found CPU fan being very noisy (or, it
> may be higher speed than before)
> The only difference between old MBD and new one is that Fan position
> (initially mounted vertically and now horizontally)
>
> Do you see any problem or unusual of this noise? any solution.
>
>
> Aung Maw (HP 94569849)
> Wanbin Enterprise Pte Ltd
> ----- Original Message ----- From: "Kenneth Whyman" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, February 12, 2009 1:50 AM
> Subject: Re: PC break down
>
>
>  Those are some very diverse symptoms. They could be from bad mainboards,
>> or
>> they could be from bad power supplies. Swapping the mainboards between the
>> cases won't help you isolate what is wrong here. Better to test the power
>> supplies on the bench to make sure they are good, then bench test each
>> mainboard with just onboard video and RAM in place with a third, known
>> good
>> power supply. Did you recently suffer any power glitches like a surge, a
>> brownout, or a blackout? Also, what are the specs on these two machines?
>> Do
>> they use identical components?
>>
>> Kenneth Whyman
>> [log in to unmask]
>> "Chance favors the prepared mind."
>>
>> On Wed, Feb 11, 2009 at 10:11 AM, Aung Maw <[log in to unmask]>
>> wrote:
>>
>>  Dear Sir,
>>>
>>> My home got 2 PC...
>>> recently, both PC can't work just a few days different.
>>>
>>> 1st one: When power ON it start to boot up as normal. On the half way it
>>> suddenly stopped everything.
>>> press power again, it start again and stop suddenly. Sometime, it stop
>>> immediately after beep sound.
>>> sometime it stopped when windows is about to load. sometime it stop while
>>> POST and RAM checking....
>>>
>>> 2nd one: Totally nothing come out. No beep, no monitor signal.
>>> Before pressing button, when power up, its power and HDD light on.
>>> Optical
>>> drive light on. CPU fan is turning... hear a little sound from HDD. Thats
>>> all. Nothing happened after that. both HDD and Power light is still on.
>>> When press power button for a few sec. Both light goes off. but Ethernet
>>> card and MTB light is still on.
>>>
>>> I tried swap CPU and RAM between two PC. Same thing.
>>> I tried reset CMOS .. No different.
>>> IT seems that CPU and RAM has no problem.
>>> But both motherboard can be spoiled???
>>> Is there any other possibilities.
>>>
>>> Can advise anything???
>>>
>>> Thank you
>>>
>>>                 Visit our website regularly for FAQs,
>>>              articles, how-to's, tech tips and much more
>>>                         http://freepctech.com
>>>
>>>
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