When I worked in the field at the school district we used to see issues with 
our HP laptops pretty regularly where the complaint would be sluggish operation 
or unexpected shutdowns.

More often than not, removing the keyboard to gain access to the guts of the 
laptop would reveal a little "Hitler mustache" of accumulated dirt, fuzz, hair, 
etc., about an 1/8th of an inch thick in the heat pipe radiator near the 
cooling air outlet.

Because the fan inlet is on the bottom, they act like a little vacuum cleaner 
and suck all sorts of nasty stuff up while operating.

Dan

Sent from my iPad

> On Jan 18, 2015, at 12:39 AM, Scott Ritchey via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Similar experience.  The video card in my noisy HP8510w laptop died.  When I
> replaced that card, I also replaced all the heat-sink grease and cleaned the
> accumulated dust and hair out of the heat-sink radiator.  The difference was
> amazing.  It is almost silent and the internal temps are moderate.  This, by
> the way, is a recertified, "off lease" machine had a lot of use before I got
> it several years back.
> 
>> -----Original Message-----
>> From: Cathey via Mercedes
>> Sent: Saturday, January 17, 2015 4:41 PM
>> 
>> Jill's been complaining for awhile now that her G5 Quad Mac has been
>> roaring its fans at her.  We've also experienced a few crashes that could
>> possibly be thermally induced.  So today I bit the bullet.
>> 
>> Googling for instructions I found how to remove the CPU assembly from the
>> computer.  This is not easy, I didn't have the correct long Allen
> screwdrivers.
>> I managed to make do with some shorter ones, a long Torx screwdriver,
>> some SAE Allen bits, and a 1/4" socket wrench set.
>> That was a pain.  Once I had the assembly out I looked it over and blew
> out
>> the dust bunnies.  It looked pretty good, no sign of leaks.
>> It's got a second-generation Delphi/Cooligy cooling system. Not ideal, but
> so
>> far so good.
>> 
>> That was the hard part.  Turning the CPU unit over exposes 15 Allen screws
>> to remove the heat sink from a CPU card.  The paste between the two looked
>> thin and dry, I wiped it off and replaced it with new.
>> Repeat times 2 for both CPU's.  Reassembly was in the reverse order, the
>> most fiddly bit was getting the CPU assembly seated to the motherboard.
>> Once assembled far enough to function I powered it on (but with the disks
>> disconnected) long enough to hear the 'bong' that indicated functional
> CPU's,
>> then I powered off and finished the reassembly.  I replaced it in Jill's
> office
>> and fired it up.
>> 
>> It came up just fine, and the fans did ramp up a bit while working harder
>> during the boot, but then the got quiet again.  That's new!
>> Time will tell whether or not this is fixed, but so far I believe it to
> have been
>> a, ahem, 'roaring' success!
>> 
>> -- Jim
> 
> 
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