[SOLVED] [SOLVED] PC won't boot if I add more components than CPU and 1 ram

grimsmo

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Dec 2, 2018
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So I've been struggling with this problem for a couple of days now, so my fingers hurt while I'm writing this after all the fiddling with cables...
I've also been through the points on the pinned post: "No POST", "system won't boot",

I just upgraded some of my PC components the other day, this is the upgrade:

CPU: i5 6600k -> i7 12700k
Motherboard: GA-Z170-Gaming K3 -> Asus ROG Strix B660-F
RAM: Fury Beast 2x16gb DDR4 -> Fury Beast 2x16 DDR5
EVGA 650 GQ-> RM750
Cabinet: Fractal Design Core 2500 -> Not upgraded
GPU: RTX 3060 ti -> Not upgraded

I installed all the new components as normal and when I tried to boot the PC, nothing happened, but the lights on the motherboard were on. After I took the motherboard out of the case and started over again with the most essential parts, I was able to boot with only the CPU and 1 stick of ram, but only if I used the 8 pin connector to the CPU. If I used the 8+4 pin it would not boot. So I though that was the problem and figured that I dont need it if I'm not overclocking. But when I started connecting the GPU, case fans, hdd etc it would not boot again. And at some point when testing with the HDD connected but the GPU disconnected I even heard a BZZZT sound and the PC turned off. I went back to the CPU + ram only build to test if I could still post, and I could. But I'm a bit scared of doing more testing now without starting to replace parts.

With CPU + 1 ram, I am able to open BIOS, and it recognizes the CPU, ram and motherboard. I tried to change the ram voltage and turn on XMP, but it still doesnt allow me to boot with a GPU for instance.

But it really started to get complicated when I tried to use my old PSU. Then it doesnt boot no matter what.
So I just built my old system back up to have a computer for my work while I start sending parts back, but... I'm not able to boot properly with my old system as it was now, and it doesnt boot at all with the new PSU. But I probably shouldn't focus too much on that. But it feels like the new motherboard or the new PSU is killing everything else.

As I said in the beginning, I've tried the points in the NO POST threat, like CMOS reset, adjust the ram, check the motherboard screws etc.

But I would really like an opinion if this could be a PSU problem or a motherboard problem, or maybe even a CPU/ram problem.
 

grimsmo

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Dec 2, 2018
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So I just found the solution to my problem.

What I did wrong was to use some of the cables from the EVGA PSU for my new Corsair PSU. Even though they look identical, this is something you never should do.
I guess I learned this the hard way, but the system is all fine now except a SSD that probably got toasted.
 

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