pc reboots without warning

[CajunJ]

Ok so I just upgraded my pc. I put in a new motherboard, CPU, and video card. Since then my pc has been rebooting randomly without warning. i ran a memory check with no problems found. I'm Thinking maybe power supply is bad? It's just weird i am having this problem as soon as i did a upgrade. please help.

 

[tiny voices]

What are all the specs of the computer and upgrades?

 

[CajunJ]

I7 4790K 4.0Ghz (upgrade)
GIGABYTE GA-Z97X-UD5H LGA 1150 Intel Z97 (upgrade)
EVGA 780 FTW edition (upgrade)
G.skill 8G
Xion 850w power supply

 

[tiny voices]

That PSU is low quality. I would replace it before it fries the computer.

Antec, XFX, Seasonic is what you want. 650-750w is more than enough.

 

[CajunJ]

so the PSU is whats causing the random reboots?

 

[tiny voices]

I would guess so. Is this anytime or only during gaming?

Also, did you reinstall windows? Not doing this after a motherboard upgrade causes all kinds of problems.

 

[CajunJ]

I've reinstalled windows twice. it seems to reboot when i'm downloading large files or watching videos. Haven't had time to load up any game yet.

 

[tiny voices]

Hmm, might not be PSU related but I would still get that junk unit out of your PC ASAP.

Check your CPU temps. What are they?

 

[DSzymborski]

I'll second what some of the others said. While it's possible that it's not the power supply causing the issue, it's hard to really know for sure with a junk power supply in the equation.

 

[CajunJ]

found the problem with speed fan. cpu is hot at 75c. guess i didn't connect fan right. thanks man

 

[tiny voices]

Yeah, that is WAY too hot for idle. You have installed something incorrectly it sounds like. Make sure you properly installed the cooler with proper thermal paste application.

 

[DSzymborski]

Good to know that it appears to be an easily resolvable issue. You should definitely consider putting in a proper power supply, however.

 

[bashbish]

I am interested to know what happened with Cajun J s random reboot. I have the GA-z97x-UD5h also and having the same issue.

I went to the BIOS and changed the Power Loading setting to "enabled"

The Bios states the following:
Power Loading: Enables or Disables Dummy Load. When the power supply is low load a self protection will activate causing it to shutdown or fail.
If this occurs please set to enabled.

I just set it so the jury is still out. I will check back in if I get another shutdown or will let you know in a couple of days if all is well.

 

[CajunJ]

Well please let me know because I am still having the problem. I have changed out every single thing but the harddrive.

 

[bashbish]

Well please let me know because I am still having the problem. I have changed out every single thing but the harddrive.

I changed out the power supply. Still getting random shutdowns. Everyhing else is working great except for that. I am calling Gigabyte this morning.

 

[bashbish]

Gigabyte tech advises to remove the CMOS battery for 1 minute (with AC power disconnected).
Rebooted with optimized BIOS settings.
That was 2 1/2 days ago and so far no shutdowns.

Also, make sure "power Options" in W7 is set to "never" sleep.

 

[georgewilliamthomas]

Hi all, i have exactly the same problem. the system randomly shuts down for about 3 seconds that boots up again.
I recently installed a few new components
These are my upgrades.
Motherboard : Gigabyte - GA-Z97X-UD5H - Intel Z97 Socket LGA1150 ATX Motherboard
CPU : Intel Boxed Core i7-4790K 4GHz Processor (BX80646I74790K)
Memory : Corsair Dominator GT 2 x 4GB 2000MHz DDR3 Desktop Memory Kit (CMT8GX3M2A2000C9)
HDD : Kingston 120GB M.2 (NGFF form factor) Solid State Drive (SM2280S3/120G)
CPU Cooler : Corsair Hydro Series H80i High Performance Liquid CPU Cooler

Old components in the system:
PSU : Gigabyte Odin 720 GE-P720A -power-supply-720w
Graphics 2 X (IN SLI Config) XFX GX260NADBF GeForce GTX 260 Black Edition Core 216 896MB 448-bit GDDR3 PCI Express 2.0 x16 SLI Video Card

I have tried removing the cmos battery as suggested above and it still does it.
I have stripped down to bare bones. and still does it.
I have reloaded windows 7 fresh as well as loaded windows 8.1 fresh (it seems worse in windows 8.1)
I can play a few hours of civilization V, but only 5 minutes of WoW as well as only about 5 minutes of Civilization Beyond earth.
But i can leave it on ALL Day downloading stuff off the internet with NO reboot at all...

I am running bios version F5 and latest graphics drivers ad well as motherboard drivers of the internet not the disk supplied.

The temperatures of the CPU never goes over 40 degrees C with the water cooling system (i installed a monitoring tool and it checks cpu temp

any advice please?

 

[bashbish]

You have done everything I did except you did not mention if you made sure your power options is set to never sleep. That’s probably not the issue but it cannot hurt to set it that way.
I have not toyed with the temperature settings on the motherboard.

How are you monitoring the CPU temperature. ? If you are using software that is inaccurate that could be an issue. You can go into the BIOS and set warning beeps when the CPU gets to temperatures that you set. This will probably be most accurate. Make sure you have a beep speaker hooked in to the motherboard. If you hear a beep on booting up than you have one. I had to buy one separate as my case did not come with one. Very cheap.

 

[tiny voices]

Sounds like PSU to me for sure. Replace it with a quality unit.