After changing CPU, suddenly overheating and pc shutdown.

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pelopidass

pelopidass

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Sep 17, 2013
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Hello everyone, I am new here!!

Yesterday I bought a used CPU (Intel Pentium D 840) to replace my old (Intel Celeron D 335).
The CPU I bought is working fine (I think) so I open the case unplug the CPU_FAN pin, I have cleaned the old thermal paste from old CPU and heatsink, connect the new, replace the thermal paste.

Everythink sounds ok.

Then I start up the PC go into bios and CPU recognised very well. The after some seconds (20 seconds I think) pc had shudown. I am trying to open it again nothing. Then I disconnect the AC Power Supply Cable and then it opened again.

I am going into bios again and then I go in temps.

CPU Temp started with 90 Celsius Degrees and in seconds it goes 100 and shutdown.

Then I open again the case and I smell something burned but it was not the cpu. It smells the thermal paste. The CPU in touch it was not so warm as I expected from 100 degrees.

I am thinking that the problem is the CPU fan, maybe is too low for the pentium d (it's the celeron cpu fan).

Any ideas?

Thank you very much.
 
Solution
huskersforever


You could always step up to the best bang for your buck CPU cooler around: http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099

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huskersforever

huskersforever

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Apr 30, 2013
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You probably used too much thermal paste. You want a minimum amount on there, while still being there.
 
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pelopidass

pelopidass

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Sep 17, 2013
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You probably used too much thermal paste. You want a minimum amount on there, while still being there.
Click to expand...

I dont remember well the amount of thermal paste I put but I will try a smaller amount and I will feedback.

EDIT. What do you mean about "while still being there"?
 
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bicycle_repair_man

bicycle_repair_man

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Jan 10, 2014
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There's one of three likely causes here.

1. The CPU fan isn't running.
2. Thermal paste is not properly applied.
3. The Celeron's CPU fan doesn't provide sufficient cooling for the Pentium CPU.

My money would be on the latter, as the Pentium is dual-core and has a significantly higher TDP; 84W compared to 130W. You should never use an old heatsink and fan on a new processor, even if they look identical.
 
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pelopidass

pelopidass

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Sep 17, 2013
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I am waiting for the stores to open to buy a new thermal paste and take a cpu from a friend.

So I will report your ideas.

Celeron CPU fan working well but I think that it cannot provide enough cooling. I will try and a bios default too.

The weird think is that in bios the cpu temp starts from 90-95 and we all know that is impossible.

It is like you are going to start up the car after hours or days (it is cold) and when you started up gets warm immediately...
 
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pelopidass

pelopidass

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Sep 17, 2013
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Update: Today I got an extra CPU (Pentium 4 3.4GHz) to test. I got thermal paste and go. I have notice that the one of the four sides (remember the fan of the 775 socket) are half broken so its not fitting very well. Until I notice that I had tested the Pentium D, Pentium 4 and the stock Celeron D CPU. All CPUs had the same result. Open the PC after some seconds freeze and shutdown.

So I think the problem is fan. Tomorrow I will test a new fan and I will post again.

 
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huskersforever

huskersforever

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Apr 30, 2013
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You could always step up to the best bang for your buck CPU cooler around: http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099

 
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