Question PC crashed several times

[semencece1111]

Hello, as you can see by the title my pc randomly crashed 3 times now, first time was 3 days ago when i was playing Dirt rally 2.0 and second time was yesterday when i was watching videos on youtube and 5 min ago(i was watching videos again). Pc just goes off and thats all no signs what is wrong and when i want to turn on pc back i can't, i press power button and it does nothing(RGB is still on on motherboard), so i turned off PSU and removed power cable then i put cable back in and turned PSU on and tried to turn on pc by pressing power button and it worked. Does and of you have idea whats the problem with PC?

PC Specs:

-asus crosshair vii hero

-ryzen 5 2600x

-GTX 1070

-16gb ram 3200mhz

-250gb ssd

-BeQuiet 500W PURE POWER 10

-Kraken x62

I changed power supply to LC-POWER 650W and my pc still keeps crashing? does any of you have any idea whats wrong, should i RMA my motherboard?
Thanks.

 

[Ralston18]

Look in Reliability History/Manager and Event Viewer for error codes and warnings that correspond with the crashes.

Open the case and double check that all components and cables are indeed fully and firmly in place.