PC keeps shutting down shortly after boot

Heldarion

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Apr 20, 2015
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4,510
Today I upgraded my PC from Win7 to Win10, then upgraded the hardware. Current specs:

PSU: Corsair RM 1000 (3 years old at this point)
Motherboard: Gigabyte Aorus AX370-Gaming K5 (new)
CPU: AMD Ryzen 7 1800X (new)
[strike]GFX[/strike] GPU: Gigabyte Aorus Geforce GTX 1060 (new)
HD: some Samsung SSD (3 years old)
Ram: Corsair Vengeance 2x 8gb DDR4

I put it together, started it up. Took a long while for the initial "beep", but eventually Windows loaded and I logged in, only for the PC to shut itself down shortly after. Afterwards, I powered the PC up a several times only to see it shut itself down every time at any random point after the boot and before Windows loaded (occasionally I'd manage to log in too). Sometimes there would be no "beep" at all and the lights on the motherboard wouldn't turn on. In this case, the PC wouldn't shut down and I had to do it manually. At some point the case fans stopped running too.

At that point, I went and re-checked everything I could think of, unplugged and plugged back in every cable and eventually stumbled into the fact that GFX was plugged into the PSU only with a 4-pin. Eventually I managed to find out that 6-pin or 8-pin connectors (I went with 8-pin) are what I'm supposed to be using for the GFX (this piece of information wasn't available anywhere in the product package, by the way). Figuring that maybe this was what had been causing the shutdowns all along, I powered up the PC once again. It got to Windows, I logged in ... and after a minute, the machine shut down again.

I have no damn clue what's happening.
 
Solution
Woah. I was not expecting that. I assumed you already had a heatsink but it was loose on the pins or you probably forgot to apply thermal paste.
You can thank technology for that. Otherwise it would've burned it real quick.

Get yourself a good heatsink.

Heldarion

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Apr 20, 2015
15
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4,510
GPU was connected with a PCIE cable alright, it's just that it was a 4-pin instead of 6- or 8-pin. I did the full clean install of WIn10 before I upgrade hardware.

I have a Radeon HD5850 gfx, I guess I could test that if need be.
 

DSzymborski

Curmudgeon Pursuivant
Moderator


There is no 4-pin PCIE cable. They come in 6-pin (75W spec) or 8-pin (150W spec).

Never do a clean install *before* upgrading hardware. That's like painting your fence before putting in a new one.
 
The only common 4-pin cable on PSUs is the EPS or "P4" cable for powering the CPU. If you are using the 8-pin version on the motherboard the 4-pin may be hanging loose, unused.

It is also +12v but you'll note the polarity is exactly backwards of PCIe so it should fry any card you manage to plug it into.
 

Heldarion

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Apr 20, 2015
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4,510
Well, this is awkward. For some reason I said 4-pin when I should've said 8-pin. The GPU is back to being plugged in with an 8-pin PCIE cable.

Another thing I just realised is that my CPU came without a fan and CPU is scorching hot to touch, so maybe that's the reason it keeps shutting down?
 
Yes. Overheating can cause the PC to shut down. Check if you have the heatsink pins loose or just reseat it again. Don't forget to apply a new set of thermal paste.

EDIT: What do you mean, "came without a fan"? Do you not have a heatsink at all?
 

Heldarion

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Apr 20, 2015
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4,510
Holy shit, no, doesn't look like there's heatsink. The last time I installed a CPU was 7 years ago and when I bought that one, the heatsink and CPU fan must've come either with the CPU or the motherboard - I didn't buy it separately. I didn't really pay it any mind for that reason.

This would've ended in a disaster if my PC hadn't shut itself down ._.
 
Woah. I was not expecting that. I assumed you already had a heatsink but it was loose on the pins or you probably forgot to apply thermal paste.
You can thank technology for that. Otherwise it would've burned it real quick.

Get yourself a good heatsink.
 
Solution