My PC won't start (maybe the problem comes from the motherboard..?)

[Stephan_6]

I've just made my new build. Everything was working fine. Then 2 days later, I turn on my PC and it won't boot. Fans goes on, then off, then on, then off (you can see a small video I've made here : https://youtu.be/OYmoj8LKO0o).

What do you think could be the problem ? (as when I turned it off the last time, everything was fine).

My config : I7 6700K ASUS MAXIMUS RANGER VIII GTX 1080 EVGA SC CoolMaster 600W Gold.

 

[Rocky Charles]

Try taking out your Motherboard Battery, leave off for 10-20 seconds, then plug it back again. Just doing a reset in the bios might help.

 

[Stephan_6]

Just did.. Same thing. PC won't boot.

 

[Rocky Charles]

You tried using one Ram stick instead? putting it in a different slot, if the same happens, then alternate with the other stick ?

 

[Stephan_6]

I just tried. Same thing... any other ideas what could be the problem ?

 

[Rocky Charles]

Hm, if you built the computer, did you make sure that the cpu is seated properly? According to the video. I wanna say the motherboard is fine...But then again, since the fans are on and off, It might be a short circuit going on. Might wanna unplug things like the Wlan cards, or audio to trouble shoot it, one by one.

 

[Stephan_6]

Ok, I'll try that. When you said "did you make sure that the cpu is seated properly", how could it be not ? I'm putting the CPU, level down the little black thing and lock it.
I'll check a youtube video to be sure I did that correctly but, i'm pretty sure it's well put..

 

[Rocky Charles]

If its not seated properly, it might give off the sound of a working computer, but with no display. Or maybe a "Check Signal" as a display. Either way, nothing won't show, but the fans and such will be spinning.

 

[Stephan_6]

So it must not be that as the pc won't boot more than 2 sec, no "bip" sound of the bios, the fans stops after the 2 seconds. The computer turns off. Then it "reboot" itself after the 2 seconds. the turn off after 2 sec..and goes on, and on and on....

 

[Stephan_6]

I've tried to unplug everything. I've let only the CPU in. Same thing. Any ideas ?

 

[Stephan_6]

Found my answer. I unplug the mobo from the case, and magically, it worked again. I reinstall the mobo into the case and now everything is working. The only thing is, I don't understand why it happened...

If someone knows the reason of a such mystery (why the motherboard works when out of the case... There only screws for difference !