[SOLVED] My computer turns off when im playing intense games. help!

RMRED

Commendable
Dec 28, 2019
39
4
1,535
To start i've got a 4 year old pc i know its very old and it will do stuff like this. 2 days before i thought i would clean up everything so i opened up my PSU (without some gloves i know im stupid but if i order from amazon it will get to me in like 2-3 months cuz i live far) I didnt touch any components i just cleaned it up with my breath and when i completed the cleaning i closed it up like before and i knew all cables perfectly i even had a photo of it so then i was playing a light game which doesent do any load on my pc ( terraria ) so the pc was fine until i opened up ( dota 2 ) and after 40 - 50 mins of gaming i decided to minimze the game and when i did my pc turned off , i did turn it on but everytime i play a game that loads my pc and i try to minimize the game my pc turns off please help. ( i tried updating all drivers , reassuring the cables if its correctly plugged in )

My PSU is CODEGEN 600W ATX 12V
GPU - GEFORCE GTX 650 TI BOOST
RAM - 8 GB OF KINGSTON DDR3
CPU - i5-3470
MOTHERBOARD - ASUS ph861 m

(sry for my english)