Question Pc keeps crashing

[Chill__Cosby]

Hi, for some reason my pc has been crashing lately. It doesn't seem like it happens when doing a specific action like gaming, so im very confused. It could be all sorts of issues, and ive tried a lot of different things already. To explain the issue in more detail, i turn on my pc, and play or do other stuff for about half an hour to an hour, before my pc (without warning) suddenly crashes. When this happens i dont get a BSOD, and it also happens so fast that i haven't been able to get a minidump. My pc normally only crashes once, and then i can play or do other stuff (sometimes it even doesn't crash at all). I have tried running the memtest86, but it found no errors, so i assume my memory is ok. I have also tried running programs like ccleaner. I also updated my bios, but that did nothing. If anyone has any ideas on why this might happen, please let me know.

My pc specs:
Windows 10 home version 2004

CPU: Intel Xeon X5670 2.93GHz

Motherboard: Gigabyte X58A-UD3R

GPU: NVIDIA GeForce GTX 970 4gb

RAM: 16 gb Gskill ripjaws ddr3 1600 mhz

PSU: Cooler Master | Masterwatt 600 lite 80plus white

250GB Samsung SSD

2 tb Seagate HDD

 

[GarrettL]

How old is your power supply?

 

[Chill__Cosby]

How old is your power supply?

Not really sure, but i have had this pc for about 2 years or so.