So i installed a new PSU(coolmax 500w) and it worked well for a couple hours. Suddenly as i was playing lfd2 my monitor went black and so did my mouse and keyboard. All just died. I havent been able to get anymof those to work but when i plug things in through the usb ports they power. Ive powered a phone and a turle beach x42 receiver. Idk what im doing wrong or if its the psu. I also have replaced the old original psu and even that doesnt work. Any help would surely be appreciated.