Desktop will not power up

On Friday, June 26, 2015 at 2:56:43 AM UTC-5, wrote:
On Thu, 25 Jun 2015 05:02:08 -0700 (PDT), Andy
wrote:


I found the problem.

I put too much thermal paste on the GPU chip and some went between two pins on the board.

Once I cleaned it off, the computer booted up and the GPU fan ran as well.

Andy

Why would that have any effect? Is that paste electrically conductive?
Otherwise it should not have any effect.

It must be electrically conductive.

Andy

On Thursday, June 25, 2015 at 6:24:44 PM UTC-5, Paul in Houston TX wrote:
Andy wrote:
On Wednesday, June 24, 2015 at 6:23:14 PM UTC-5, Paul in Houston TX wrote:
Andy wrote:
On Monday, June 22, 2015 at 10:16:58 PM UTC-5, Paul wrote:
Andy wrote:


It powers up if the video card is not installed.

Does that mean the card went bad ?

Andy

So now you have to take a closer look
at what you've done to the video card.

Even if the fan connector went on backwards,
it should have started.

Maybe it wasn't seated properly in the slot.

Paul

When I took the fan off, the computer turned on.

I have requested a refund for the fan.

I will look for another PCI Express card.

Andy

What voltage does your new fan require?
If it's a 12v fan then test by plugging into a 12v fan header on the mainboard
or get a 12v fan splitter cable that runs off a 4 pin Molex.
http://amigakit.leamancomputing.com/...ower_cable.gif

I found the problem.

I put too much thermal paste on the GPU chip and some went between two pins on the board.

Once I cleaned it off, the computer booted up and the GPU fan ran as well.

Andy

Excellent!

They claim my paste was non-conductive.

It seems obvious it is based on my experience.

Andy

Gold thermal compound (Thermal Grease) for CPU use
*Easy apply syringe for 7-10 small or 3 -4 large CPU's - when used properly
*Helps the heat dissipation from a CPU to a heatsink
*Gold silicone thermal compound
*Electrically Non-conductive

Andy wrote:
On Thursday, June 25, 2015 at 6:24:44 PM UTC-5, Paul in Houston TX wrote:
Andy wrote:
On Wednesday, June 24, 2015 at 6:23:14 PM UTC-5, Paul in Houston TX wrote:
Andy wrote:
On Monday, June 22, 2015 at 10:16:58 PM UTC-5, Paul wrote:
Andy wrote:

It powers up if the video card is not installed.

Does that mean the card went bad ?

Andy
So now you have to take a closer look
at what you've done to the video card.

Even if the fan connector went on backwards,
it should have started.

Maybe it wasn't seated properly in the slot.

Paul
When I took the fan off, the computer turned on.

I have requested a refund for the fan.

I will look for another PCI Express card.

Andy
What voltage does your new fan require?
If it's a 12v fan then test by plugging into a 12v fan header on the mainboard
or get a 12v fan splitter cable that runs off a 4 pin Molex.
http://amigakit.leamancomputing.com/...ower_cable.gif
I found the problem.

I put too much thermal paste on the GPU chip and some went between two pins on the board.

Once I cleaned it off, the computer booted up and the GPU fan ran as well.

Andy

Excellent!

They claim my paste was non-conductive.

It seems obvious it is based on my experience.

Andy

Gold thermal compound (Thermal Grease) for CPU use
*Easy apply syringe for 7-10 small or 3 -4 large CPU's - when used properly
*Helps the heat dissipation from a CPU to a heatsink
*Gold silicone thermal compound
*Electrically Non-conductive

Specification
Items HY610 Unit
Color Gold No
Thermal Conductivity ＞3.05 W/m-K
Thermal Impedance ＜0.073 0C-in²/W
Specific Gravity ＞2.48 g/cm³
Viscosity 1000 No
Thixotropic Index 380±10 1/10mm
Moment Bore Temperature -50~280 0C
Operation Temperature -30~240 0C

Ingredients
Silicone Compounds 30 %
Carbon Compounds 20 %
Metal Oxide Compounds 50 %

There's some precise chemistry there for you. Spells
it out in no uncertain terms.

Now, they also sell brake pad grease (antiseize?)

http://www.halnziye.net/products_det...ductId=59.html

And, oh look, it has the same quoted thermal conductivity :-)

http://www.halnziye.net/products_det...uctId=206.html

I'm just a little annoyed, because I can't get an MSDS,
and get the goods on that stuff, whatever it is.

Now, this is the ingredient list of a brake antiseize
compound from a North American company. It has a copper
color, because, it's 50% copper.

COPPER 7440-50-8 40 - 50%
HYDROTREATED RESIDUAL OIL (PETROLEUM) 64742-57-0 30 - 45%
BENTONITE 1302-78-9 [cat litter] 5 - 15%
GRAPHITE 7782-42-5 5 - 15%
POLYISOBUTYLENE 9003-27-4 1 - 10%
ZINC OXIDE 1314-13-2 1 - 5%

So there is a metal oxide in there, but only in minor amount.

Zinc Oxide was an ingredient in Radio Shack heatsink compound.

*******

Of course, it could all be a coincidence, and I'm hallucinating.
Copper is an expensive material to work with, and who would
waste that much copper ? Based on the stated ingredient list
of the HY610, where does the gold color come from ? Zinc oxide
is white.

*******

In this thread, some overclockers use brake antiseize on purpose.
And one of the comments is, unlike other compounds, it is conductive.
Something you could check with your ohmmeter.

http://forums.extremeoverclocking.co....php?p=3334401

Paul

On Monday, June 22, 2015 at 4:07:32 PM UTC-5, Andy wrote:
I replaced a video card fan in a Compaq desk system.

Now it will not boot.

Power is getting to the power supply.

And I changed out the switch on the front cover, but still nothing.

What else can I check ?

Thanks,
Andy

Speaking of Radio Shack.

They used to be a good source of electronic components.

Not any more.

Andy

In message , Andy
writes:
[]
Speaking of Radio Shack.

They used to be a good source of electronic components.

Not any more.

Andy

Do they still exist? In the UK, they were Tandy - that isn't the whole
story as they weren't _quite_ the same company, but their product range
included a higher proportion of Radio Shack* components that would seem
plausible if they weren't related somehow. (Their assembled electronic
products - e. g. radios and the like - used the brand name Realistic.)

AFAIK they're long gone he Maplin seem to have filled that niche, in
that they're about the only place you can buy components as such, but
they have far fewer stores than Tandy did (or at least it feels they
do).

* I was going to say RS, but then remembered that would normally in the
UK to mean RS Components (a company whose name originally, for those
with really long memories, was Radiospares).
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

Illinc fui et illud feci, habe tunicam?