CPU Running at 100°C From Startup

Matthew_282 · Aug 11, 2017

I have run into an issue that started Wednesday, and I am at my wit's end. I have tried to troubleshoot it to no luck and am hoping someone can help me.

My computer after restarting for a windows update now runs at a constant 100°C, as soon as it starts up. Very much not normal.

My specs are:
i7 7700K, 4.2 GHz
16GB ram
MSI Z270-A pro mobo
GTX1070

Running diagnostics, it is not even running at a high capacity. While running a spyware check I am at 15% CPU usage. 0.1% otherwise.

Does anyone know what could be causing this issue? If more information is needed I would be happy to provide anything.

Xibyth · Aug 11, 2017

Sounds like an error reading the temperatures or the package sensor is busted. Have you tried using any other monitoring software and making sure you only use one at a time?

nitinvaid20 · Aug 11, 2017

What are the cores Temp?

Matthew_282 · Aug 11, 2017

Xibyth :

Thank you for your reply. I have tried using Passmark first, and then Speccy to confirm (which I did not have beforehand, but wanted a second point to compare). I opened the machine after and there was a lot of heat coming from the dedicated cooler and CPU itself.

What I have not tried yet is checking the BIOS, because I have been unable to get it to work with windows 10. The shift+shutdown method and pressing F2 did not work for me (thought it might have been my keyboard, tried another simpler one with no luck). I will try again with delete to see if it can work that way.

Matthew_282 · Aug 11, 2017

nitinvaid20 :

Cores 1-4 are all between 97°-100° C.

Hardware Brad · Aug 11, 2017

The heat sink may not be properly installed.

Matthew_282 · Aug 11, 2017

Hardware Brad :

I did take a look when I first opened my PC to check it - it looked like things were OK on a surface level to me but I am certainly not an expert.

Could it be an issue with the thermal paste? I did not check the connection between the heat sink and CPU. I could attempt to clean and put new paste on. Would that result in such drastic temperatures if the connection was not solid? The odd part to me is that this just started happening - but correlation does not mean causation, and the windows update could just be a red herring.

Hardware Brad · Aug 11, 2017

Matthew_282 :

I would definitely clean and repaste the CPU and make sure the cooler is mounted tight. What CPU cooler are you using? The i7-7700k did not come with a stock one.

USAFRet · Aug 11, 2017

Matthew_282 :

Just looking at the CPU cooler does not indicate correct installation.
Instantly ramping up to 100C says the CPU block installed not quite right.

Matthew_282 · Aug 11, 2017

Hardware Brad :

Thanks, I will try that. The cooler is a Asetek 550LC 120mm watercooler.

Matthew_282 · Aug 11, 2017

USAFRet :

Thank you for your reply; I know that the look was not enough, but it was really 'what I could do' at the time. It sounds like that is the general response is to check the installation and I will do that when my work day ends.

I appreciate everyone taking the time to look at this post. If you have another potential solution, I would like to hear them as well in case this does not resolve the problem.

bigpinkdragon286 · Aug 11, 2017

Make sure the pump is circulating coolant through your CPU block, and if you have a choice for pump speed, set it to high to test the temperatures. Also, if there are settings for the fans on the radiator, set those to high as well.

Have you moved anything lately, such as the computer case, or the radiator? Sometimes there is air in an AiO (All-in-One) cooler that gets into the pump and degrades performance. This may be fixable by reorienting the system while running.

Matthew_282 · Aug 11, 2017

Hardware Brad :

Kind of a combined solution here - I did the above and that helped me troubleshoot that the issues was the CPU cooling. After cleaning and reparting, there was no improvement. Even though it seemed functional, it was not doing its job. Purchased a new all in one and it works great (temps now around 50 when doing intensive tasks/gaming, back down to 30 when done).

Thanks again everyone for their help!

Hardware Brad · Aug 12, 2017

Matthew_282 :

Hardware Brad :

Kind of a combined solution here - I did the above and that helped me troubleshoot that the issues was the CPU cooling. After cleaning and reparting, there was no improvement. Even though it seemed functional, it was not doing its job. Purchased a new all in one and it works great (temps now around 50 when doing intensive tasks/gaming, back down to 30 when done).

Thanks again everyone for their help!

It is possible the pump died in your other one. It doesn't matter too much now since you replaced it, but you could check by plugging the pump header into the cpu fan header on the motherboard and see if it shows any RPMs in the BIOS.

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