PC Keeps Switching off on its own

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This is a new build and I'm experiencing the PC just switching off on its own. This happens when I play games, or browsing the interweb. Today it must have switched itself off and immediately rebooted about 20 times. This is extremely frustrating. What's causing this? PSU?
 
Check the temps of cpu and system.

Also list full specs including make & model of PSU.
 
The PSU is a superflower leadex 550w gold. The CPU is i5 6600K, CPU temps are ave 35c and system is about 33c.
I have 16gb DDR4 hyper X fury 2666mhz (2x8)
Samsung 850 Evo 250gb ssd
Seagate 2tb sshd
Asus Z170-A motherboard
Fractal Design R5 case
MSI GTX 750 1gb
Coolermaster 212 HSF
 
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Since I posted this, the PC has turned off another 3 times. Something is definitely not right. I don't know if it's software related with windows 10, or hardware. I'm baffled and can't find a solution anywhere.
I have posted elsewhere on this forum about the PC, also not posting. I RMA'd the motherboard last week, and OC's where very helpful in replacing the mobo. But there is clearly something else, which is not right.
 
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I would check for loose connections first, loose wires, cards/memory not plugged in properly, loose power switch/cable etc.

Then maybe strip it down and rebuild it out of the case checking each bit before you install it, just try with CPU, one Ram stick and boot drive first then add in the other stuff one at a time testing for reboots as your doing it.
 
I would check for loose connections first, loose wires, cards/memory not plugged in properly, loose power switch/cable etc.

Then maybe strip it down and rebuild it out of the case checking each bit before you install it, just try with CPU, one Ram stick and boot drive first then add in the other stuff one at a time testing for reboots as your doing it.

I've done all of the above, sometime it boots, sometimes not! :confused:
 
I had a very weird issue like this as well but it turned out it was my front panel connectors shorting because they were in the wrong connections although I also got a watercooling loop in as well which made me think it was temps, also I started only having problems when I got Windows 10 so it could be maybe be that but to be honest it could be just your new CPU bud
 
He's stripped it down to mobo ram cpu and it's still rebooting so it's gonna be a faulty Psu or Cpu it seems since the mobo has been rma already. I guess your gonna have to get your hands on a psu from someone. If that doesn't work rma the cpu.
 
He's stripped it down to mobo ram cpu and it's still rebooting so it's gonna be a faulty Psu or Cpu it seems since the mobo has been rma already. I guess your gonna have to get your hands on a psu from someone. If that doesn't work rma the cpu.

I guess I'm going to have to buy myself another PSU. I'm running memtest86 right now, but have way through, the PC just switches off. How damn annoying this is! Lol;)
 
Ouch. I would suggest making sure the BIOS is up to date but I'd not want to risk updating it in case half way through it throws a reboot.

Keeping an eye on this thread. PSU is normally the cause for this but not really seen it happen when outside of Windows/Games.
 
Ouch. I would suggest making sure the BIOS is up to date but I'd not want to risk updating it in case half way through it throws a reboot.

Keeping an eye on this thread. PSU is normally the cause for this but not really seen it happen when outside of Windows/Games.

Hi the Bios is all up to date. I managed to buy a new PSU and RMA'd the other one.
So I installed the new PSU and I'm still getting these shutdowns. The only thing left now is quite possibly the RAM is bad? Would bad RAM cause these unexplained shutdowns?
By the way the PSU I bought is a Corsair RM750i, nice and quiet.
Could my DDR 4 Hyper X fury 16 gb (2666mhz) have compatibility issues with my Asus Z170-A mobo?
 
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