Board starts OK and then restart

[Reynaldo Negrete]

I have an ASUS P8H61-M LE/CSM R2.0 and it was working ok until last week, it began to reboot anytime. It isn't a temperature problem because I was checking the temperature of the components and it was normal all time. I check the voltage levels and were normal too. So, I don't know what's happening with my PC and would like to fix it. Some help, please?

 

[Gbz Goldenboyz]

whats your psu?

 

[EasyLover]

Exactly what was the last hardware/software change that you made after which this behavior started

 

[Reynaldo Negrete]

I haven't change anything... It was working perfectly and, suddenly, the problems began. I've a processor Intel Core i3-2120.