PC issues not technologically smart HELP

so my PC randomly started powering down its an overheating issue im pretty sure but there is no dust every fan between fans on top gpx card fan and fan on motherboard is running could be a power supply issue but its powering off after about an hour of use ive switched back to my laptop but i need to use my desktop again or im going to lose it any idea by this short explanation ive already tried googling it but no temps seem to be going overboard i just have no clue anymore

 

What are you using to measure the temperatures?

 

cant even remember tbh was some internal shit i was just watching my older brother told me to use it he repairs comps and shit but hes across the world and shit tough to talk hoping you fellars can help any recommendations on what i should use?

 

CPU-Z

 

thank you ill give it a shot and we will see whats going on just bought a new power supply too kinda sad lol

 

what psu do you have? could be that not enough power is being given to the computer parts

 

@Ben Calcium

 

its corsair CX750 kinda basic powersupply but nothing i have is really over the top all really decent meh stuff tbh motherboard cpu is 4 years old that could of just shit the bed right?

 

Could be a problem with the RAM. Had a similar problem not to long ago and was due to the fact I had a memory leak.

 

Run CPU z and show what it says. Don't buy stuff before diagnosing the problem.
- When does it crash?
- What happens after it crashes?
- Why would you assume it's an overheating issue?

Don't assume, test. If memory is bad, memtest. If psu is bad, stresstest. If cooling is bad, stresstest.

 

yeah its an overheating issue in the motherboard thank you @WhoTookDeezNuts and everyone else who responded thanks guys