Question My pc all in one keep power cycling

[ikhlas2121]

i have a question, i didnt know very well about hardware so im going to ask about why my all in one pc, lenovo keep power cycling, it started when i tried to play games but in the middle of loading the game my pc just completely off and then a couple seconds later it started to on again (sorry for bad engllish) and yeah i dont know whats happening

 

[rgd1101]

what the all in one? how old it is? check temperature?