[OZAPRS] OT. Wierd hardware problem

[VK4PKT]

Hi Norm

Try turning off any thermal protection in the BIOS. More specifically 
anything that varies the CPU fan speed in response to system temperature. 
You want the CPU fan to run full speed all the time.

I've stuck this effect several times where the computer is set in bios to 
vary CPU fan rotational speed and also set to shutdown in the event of CPU

fan speed falling below a certain point (often 2000rpm).

Many thermally adjusted CPU fans will be as low as 900rpm when the machine

is cold. The machine then refuses to start. In these cases I either switch

off the bios CPU fan speed adjustment and leave it on full speed or apply 
12v directly to the CPU fan from the powersupply. The fact directing warm 
air on the heatsink quickly fixes the problem gels with this idea.

You can of course "also" disable the ability to shutdown if the CPU fan 
falls below the set threshold if you wish but I do not unless no other 
option is there.

Regards
Ari

VK4ARI


----- Original Message ----- 
From: "Norm, VK2XCI" <vk2xci at aanet.com.au>
To: "OZAPRS" <ozaprs at aprs.net.au>
Sent: Wednesday, July 19, 2006 9:06 AM
Subject: [OZAPRS] OT. Wierd hardware problem


> Athlon X2600+
> ECS KT600-A mobo
>
> I have seen many CPUs which fail when they get hot.This is the first
> time I've ever seen one which won't run when its cold!!! Not real cold,
> Winter's morning room temperature... like 12 or so deg c
>
> With each attempt at booting, it gets a little further until it finally
> makes it to operation. After a short run, it reboots every time. If it's
> been off for an hour or so, no go!
>
> I had to heat the damned thing with a hot air gun to get it to boot!
>
> I was able to direct a stream of warm air directly onto the heatsink
> without heating too much of the mobo, and lo and behold it burst into 
> life!
>
> Has anyone else seen this?
>
> Any other clues? I don't want to have to replace the mobo and CPU and I
> cant find a replacement CPU.
>
>
> -- 
> Norm, VK2XCI,
> Mildura, The Wintersun City
> QF15bt
>
> Victoria, Australia.
>
>
> -- 
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