This kind of problem doesn't appear very often, but every electronic
device/system has both a maximum AND minimum operating temperature.  If
you exceed either of those thresholds, then there will be problems.

In this case, I think you are saying that by cooling the board (and not
the chips) you can cause a failure.  If that is correct, then you probably
have either a cold solder joint or a broken trace (metal path).  Remember
back to your basic electronics training that covered the topics of thermal
expansion and cooling. As you cool the board, the parts shrink and "pull
away" from each other causing an open circuit.

Jim Meagher
=====
Micro Solutions Consulting        Member of The HTML Writers Guild
http://www.ezy.net/~microsol     International Webmasters Association
410-543-8996                MS Site Builder Network - Level 2 member
=====
----- Original Message -----
From: Jun Qian <[log in to unmask]>



> Hello all,
>
> found that when I cool down the
> area around cpu (around socket 7 without cool the cpu), the problem
> appear. On other computers, I tested with same cooling and no problem at
> all.
>
> How could this happen? Can anyone give me an explanation of this? I've
> seen a lot of heat problems, but never seen this kind of problem before.
>
> Thanks
>
> J Qian
>
>                PCBUILD mailing list is brought to you by:
>                             The NOSPIN Group
>                             http://nospin.com
>

            PCBUILD maintains many useful files for download
              on our web site - visit our download page at:
                     http://nospin.com/pc/files.html