new home built pc reboots randomly by itself

gmoore23

Honorable
Jun 23, 2014
9
0
10,510
As the title states. i recently built myself a gaming pc. the build went very well with no problems and the pc booted up no problem. the first 30 minutes that i had the pc on though it would reboot quite often when i wasn't using it (it ran perfect when i was using it). I thought this was because i hadn't updated all the drivers yet and hadn't run all the windows updates yet so i ran the updates and for the next 3 days the pc ran perfectly , running fast and smooth under prolonged use. Last night however while i was playing a game the pc rebooted itself once again. it had been running for a solid 7 hours. no error message appeared and the pc rebooted extremely fast as it usually does. I checked the cpu and gpu temperature about 5 - 10 minutes later and both were around 38 degrees so heat doesn't seem to be the problem. My psu is an XFX XTR series 750w fully modular 80 plus gold certified .
All help will be really appreciated
 

gmoore23

Honorable
Jun 23, 2014
9
0
10,510
Case - NZXT phantom 530 full tower
Motherboard - Asus maximus vii hero z97
CPU - Intel i5 4670k
CPU Cooler - Coolermaster hyper 212 evo with pk-3 thermal compound
GPU - Gigabyte Radeon 290x windforce
Ram - 8GB G.Skill DDR3 PC3-14900 1866MHz Sniper Series (9-10-9-28) Dual Channel kit
HDD - Seagate barracuda 1tb
SSD - Samsung Pro 128gb
DVD drive - Asus
OS - Windows 8.1
PSU - XFX XTR series 750w fully modular 80 plus gold certified
Monitor - Asus vg248qe dvi connection (this probably isn't important)