CPU Overheating during bootup

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schack13

May 5, 2018
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My computer has been having issues the past two days with freezing up, running extremely slow, and requiring booting back up. I noticed my Corsair H55 water cooler's radiator has been extremely hot to the touch and the fan behind it wasn't running. When my computer was still able to run i downloaded a resource monitor and it informed me some of my CPU cores were running as high as 60-65'C during desktop idling. I turned my computer off, removed the heatsink, cleaned off the old thermal paste, and applied a new bead of paste. Now however my computer fails to successfully bootup completely. It gives me an American Megatreads screen with the error message "CPU Overheating" after around a min of trying to boot-up. If the radiator and cables of the cooler are hot but the fan isn't spinning is the fan at fault? Is the fan part of the water cooler or is it part of the system fans attached to the motherboard/power supply unit? My system is a little aged, my Asus X-99A is motherboard and everything else is around 3.5 years old except for the water cooler, it's 2.5 (had to replace the stock unit as the heat sink was making a rattling noise). Should i try replacing the rear fan behind the radiator or should i switch the water cooler out for an air cooler?
PS: I'm not using too much thermal paste am I?
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Solution
electro_neanderthal
First of all, a dead fan can cause the motherboard to refuse to start up, but I don't know about other issues. Fans are cheap, so replace it if you can, or use a case fan just to verify that it is or is not the fault of the fan - as long as the CPU_FAN header and the pump header are providing power and are plugged in.

Is the pump plugged in? If so, I suspect it's dead and isn't moving water around the loop, causing the overheat after a short amount of time. Is the waterblock on the CPU warm when it overheats?

As far as thermal paste, that should be fine (might not be enough tension, but I can't actually verify that, so just make sure it's tight enough).
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electro_neanderthal

electro_neanderthal

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Jan 22, 2018
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First of all, a dead fan can cause the motherboard to refuse to start up, but I don't know about other issues. Fans are cheap, so replace it if you can, or use a case fan just to verify that it is or is not the fault of the fan - as long as the CPU_FAN header and the pump header are providing power and are plugged in.

Is the pump plugged in? If so, I suspect it's dead and isn't moving water around the loop, causing the overheat after a short amount of time. Is the waterblock on the CPU warm when it overheats?

As far as thermal paste, that should be fine (might not be enough tension, but I can't actually verify that, so just make sure it's tight enough).
 
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schack13

May 5, 2018
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electro_neanderthal

electro_neanderthal

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Jan 22, 2018
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Eh, if OP is not overclocking, I'd recommend a regular air cooler. Something like the Arctic Freezer 7 pro is cheap, quiet, and works well for stock clocks and I suspect a wee bit of overclocking from my experience with it.
 
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schack13

May 5, 2018
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I've swapped in a spare stock fan, the prongs connects on the motherboard are definetly working, since my replacement fan spins during bootup However the heat sink over the cpu is getting scaldingly hot during bootup but the heat isn't felt on the radiator or cables. I think you're both right, even though my cooler pump is plugged in and sounds like it's running, but it's become defect and isn't actually pumping the heated water away from the cpu. I take it the 50,000 lifehours claim is a bit of a stretch since I've gone thru 2 units in 3.5 years now.
And yes I think my cpu is a 5000 (5840k?) series with 10% overclock
 
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electro_neanderthal

electro_neanderthal

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Jan 22, 2018
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Yeah, definitely sounds like a busted pump. And ow! 2 units in 3.5 years? That absolutely sucks. My H50 has been going strong for approaching 5 years now (can't believe it's been that long). I guess I got lucky? Hopefully you find a better product that fits your needs.
 
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schack13

May 5, 2018
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There's a micro center an hour away from me so i was fortunately able to pick up a new cooler today. I upgraded to an H100i v2, however i kind of underestimated the size of the unit. With the fans mounted on the underside, it won't fit since the motherboard has cable inputs and some big blocky component on the top that the fans can't snuggly fit alongside. So instead i mounted the fans on the top slide space on the top of my tower and bolted the radiator to them from beneath (There's a flow cover that goes over them). I have them oriented to suck air flow in and I have a rear fan oriented to blow air out. Is this ideal or should I reverse the air flow?
https://imgur.com/tuRBAlM
https://imgur.com/CIseBK1
https://imgur.com/sMwVDJr

BTW i know why the exhaust fan behind my original cooler's radiator wasn't working. Check out the burned out spooling on it vs a working fans:
https://imgur.com/gGFzeA0
https://imgur.com/Xk5gn9C
 
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electro_neanderthal

electro_neanderthal

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Jan 22, 2018
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My brother-in-law has the same configuration... though I think he has the fans pulling out instead of pushing in? Oh well, I think the biggest difference will be noise (I deal with my rad in push config, so it's no the end of the world... though it is loud) and general case temps; but since that becomes a positive pressure config, the case temps won't be bad by any means.

I'd test it out to see if you like the noise or not, that will really be the biggest difference.
 
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