PC Keeps Switching off on its own

Swinners

Swinners

Swinners

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29 Aug 2015
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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?
 
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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BluD said:
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.
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I've done all of the above, sometime it boots, sometimes not! :confused:
 
BluD said:
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.
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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;)
 
BuToNz said:
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.
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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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XfXGamer2014 said:
Sounds like a loose wire or connection forcing it to shut down. You sure nothing is getting caught in 1 of the fans? have you tried stripping and building it again.
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Yes sir, I've had this thing in bits, I'm ready to throw the thing away. I just can't diagnose the constant crashes and non posts as well.
 
XfXGamer2014 said:
Pc's can be a real pain in the arse, hope you get to the bottom of it mate.
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Thx XfXGamer, I need a break from it, a few beers down the pub, and maybe a sledgehammer, I'm sure that will fix it! On a serious note, I'm going to breadboard the system again and start from scratch. I might just have to end up taking it to a PC repair shop.
 
What's annoying is the thing may boot up into windows 10, last a few minutes and then switch off, boot up again or not, if it does it goes off immediately. If something is shorting it out then what would it be? Could the CPU be causing this? I've replaced the PSU, same issues. Could the HDD be at fault? Faulty RAM? Mobo?
 
Here's the latest, I've literally breadboarded this system. I have on my makeshift test bed the Mobo, CPU, HSF, PSU plus 1 stick of DDR4 8gb (2666mhz) hyper X ram. Connected to the mobo is a VGA cable to the onboard graphics, keyboard,mouse and a USB stick with memtest 86 loaded up.
I've run memtest several times, and each time the system has crashed, whilst running the test. I've ran this test for each dimm slot and swapped the ram sticks around. I've not managed to run a complete pass of the test.
Plus what I've also noticed is that certain dimm slots don't recognise the brand of RAM. A1 slot does show (Ram info) the make and serial number, but A2 and B1 and B2 show (Ram info: Unknown MHz) nothing.
As far as the tests go, no errors show up for the RAM before the crashes.
So what can we conclude from these tests, is the RAM ok or faulty?, is there a problem with the motherboard's (again) Dimm slots, or is it something else?
I'm already RMA'ing a PSU, do I include the mobo and RAM as well?
Here's another thing to think about, the bios on the mobo is by AMI, I have a little test speaker connected to the mobo, 1 beep on post according to the interweb means a DRAM refresh failure, can anyone confirm this?
 
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