Question Is this an symptom of overheating or much worse?

[MPS_1420]

So what happened is that i've been playing 4 hours and suddenly my PC, or more like the motherboard, shuts off the display and keyboard doesn't react to input. But the power supply keeps running and so does the lights and fans. After leaving a while turned off, i've looked at the BIOS and the CPU temperature reaches to 70° celsius just in turning on the PC. So i'm wondering if what happened is that the CPU overheated and half shutdown the PC since the power supply kept going. Or something much worse like the motherboard and PSU failing? Need some help.

Here are the components:
MSI H81M-E33
PSU Cooler Master Elite V3 500w
Intel Core i3-4160 3,60 GHz

 

[Lutfij]

Welcome to the forums and a Happy New Year, newcomer!

MSI H81M-E33
PSU Cooler Master Elite V3 500w
Intel Core i3-4160 3,60 GHz
You forgot to include these:
Motherboard:
Ram:
SSD/HDD:
GPU:
Chassis:
OS:
Monitor:

As for your CPU, include the cooler for your processor. Might want to also pass on a picture of the innards of your PC.

PSU Cooler Master Elite V3 500w
That's actually a horrible unit. How old is the unit in your build?

i've been playing 4 hours
What were you playing on the system?

 

[MPS_1420]

Welcome to the forums and a Happy New Year, newcomer!

MSI H81M-E33
PSU Cooler Master Elite V3 500w
Intel Core i3-4160 3,60 GHz
You forgot to include these:
Motherboard:
Ram:
SSD/HDD:
GPU:
Chassis:
OS:
Monitor:

As for your CPU, include the cooler for your processor. Might want to also pass on a picture of the innards of your PC.

PSU Cooler Master Elite V3 500w
That's actually a horrible unit. How old is the unit in your build?

i've been playing 4 hours
What were you playing on the system?

Thank you! I've forgot those; here are the full specs:
Motherboard: MSI H81M-E33
RAM: Kingston 2 sticks of 4 GB DDR3 1333 MHz in Dual Channel
SSD/HDD: 240 GB/500 GB 7200 RPM
GPU: MSI Nvidia Geforce GT 1030 2G Low Profile
Chassis: Cooler Master Masterbox Q300L
OS: Windows 10 Pro 64-bit
Monitor: AOC 907

That's actually a horrible unit. How old is the unit in your build?
It's from a few months ago, my brother which is an tech enthusiast gave me for my first rig. It worked fine until recently that, sometimes it doesn't turn the CPU and by the forth attempt, it turns on properly.

What were you playing on the system?
Call of Duty: Modern Warfare 2 (2009), i've had no issues like display flickering or slowdown within those 4 hours, although by the time i've started another game (GTA 5), the display flickered once and when i've pressed Alt+Tab, it died in the middle of switching to the desktop resolution.