Black Screen on Boot Up After H100i GTX Install

UnrealCJS

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I installed my new H100i GTX heatsink yesterday, and even though there were some problems with the process of actually installing it it did seem to run fine. How ever after about 30 to 60 mins i'm pretty sure i heard what sounded like an electrical snap, and then my entire computer instantly shut off and wouldn't turn back on until i changed the power socket that the computer was plugged into. How ever now when i boot up the heat sink flashes red once and all i get is a black screen no BIOS flash screen or anything just a black screen. And after i press the power button it'll only turn back off again if i hold the power button again, it won't turn off if i just press it like normal.

Before i go into all the things i have tried to fix it and what i think the issue may be, i'll like all of my computer components:

MOBO: Gigabyte GA-990FXA-UD5
CPU: AMD FX-9370
GPU: Sapphire 7870x2 Crossfire
RAM: 1x2GB Kingston HyperX DDR3 3x2gb Corsair XMS3 DDR3
PSU: Corsair HX850

Just say if any one wants to know any of the other things in my computer, i just listed all the core components here as everything else should be fairly inconsequently to the problem i have.

One things to note if that there isn't a green led showing up on my MOBO anymore, and i swear there used to be. How ever power is still getting to fans so i know that there is at least some power running through the MOBO. I also had problems with the heat sink mount/MOBO backplate when i was installing the heat sink, no matter what i did the backplate the the mount was screwed onto was loose and moving up and down after i put the mount on. I fixed this by taking 4 nylon washers that i got from and fan that i had to take off to fit the heat sink radiator in the case and putting them on the backplate. This seemed to and fixed the problem as the heat sink was no longer moving around even after i put the heat sink itself on. How ever when i woke up today and decided to remount the heat sink to the nylon washers didn't seem to be big enough any more, as the backplate was moving around when i put them on it. So i decided to just use some metal washers on the backplate instead, 3 on each corner has stopped the backplate from moving around at all and the heat sink seems to be very secure when i install everything.
I've tried putting in the old heat sink but that did nothing, however i don't think that there is enough thermal paste left on it and i don't have any more right now. Other wise i would also try the other 2 spare heat sink i have lying around. I have also tried only putting 1 RAM stick in at a time but that did nothing, and if there was a power fluctuation from the PSU that fried a bunch of components then surely it would have fried all the RAM stick not just 1? I also don't have any spare RAM sticks lying around to test if all the RAM is indeed fried and that is the issue.
Another thing i've tried is taking everything out and having only the bare essentials in the computer but that did nothing.

Right now i've almost given up and settled on it being a MOBO problem, i think there was a power fluctuation for what ever reason that fried my MOBO as there is no longer a green light to tell me that the MOBO is receiving power. I guess making this thread is a last resort before i take my rig in some where so that they can confirm whether or not it is a MOBO issue.

tl;dr

After installing H100i GTX and it working for an hour then just shutting off i get a red flash from the heat sink and just a black screen on boot up. there is also no green light on the MOBO any more. Tried a bunch of things, i'm stumped. Please help if you can :(
 
Solution
You didn't happen to use the backplate that came with the cooler, did you? That backplate was only designed for Intel CPUs.

Did you put anything between the metal washers you used and the backplate/motherboard or were they directly touching the board?

It sounds like your motherboard fried. I would inspect it closely for any damage or burn marks, maybe a missing part. An electrical snap is never a good sound to hear.

You didn't happen to use the backplate that came with the cooler, did you? That backplate was only designed for Intel CPUs.

Did you put anything between the metal washers you used and the backplate/motherboard or were they directly touching the board?

It sounds like your motherboard fried. I would inspect it closely for any damage or burn marks, maybe a missing part. An electrical snap is never a good sound to hear.

 
Solution

UnrealCJS

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No i used the backplate that came with my motherboard, and when the electrical snap happened i was using the nylon washers. I'm using the metal washers at the moment but it stopped working well before i put them on the backplate, i stopped using the nylon washers as they didn't fit any more. I'm assuming they got warped by the heat and then cause the heat sink to shift which caused the CPU to overheat very quickly and then some how that caused the power surge.

But yeah i've come to the conclusion that it is very likely that my motherboard is fried, but i don't have a spare motherboard to test that theory with. So i'm just going to have to take my rig into a computer repair place, unless some one on here thinks its some thing else and can come up with a fix.

And i haven't noticed anything missing or any burn marks as i was trying to fix it.
 

UnrealCJS

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After some digging around online i found out that it is very common for the backplate to move around before you put the heat sink itself onto the mount, but after when everything is on it shouldn't move around. So i tried without any washers and it fits well, computer still won't boot but atleast i solved that problem.

I am also now very sure that the motherboard is dead, there are no beeps on startup and no led's. But i'm taking it into a repair place tomorrow just to confirm that plus to check if any thing else is dead, as i don't have enough spare components to test it myself. Thanks for trying to help though :)
 

UnrealCJS

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Turns out my CPU was fried, as the Heat sink was moving around to much which in turn overheated the CPU until it fried. I've just installed my old fx-8150 instead. I guess I've learnt never to buy a corsair heat sink again though.
 
Corsair is not the only heatsink that has this sort of setup. It allows them to regulate the pressure so you don't over tighten it. I have installed, and currently use the H100i, plenty of Hydro series coolers.

I find it strange that the CPU itself actually died though. Most CPUs have thermal protection limits in place. It should have been shutting itself off before getting to the point of damage.

I would just say be very careful in the future. It is always best to double check and make sure everything is tight.
 

UnrealCJS

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That's the thing that confused me. The heat sink i had before was a H60 and i replaced it as if i didn't have the settings on full then as i'm playing a game my computer would just shut off because my CPU was getting too hot. But for whatever reason this just didn't happen this time, it just kept running until it died. The whole situation is very strange and has left me a little confused.

But for now i'm just happy i can use my computer again!