Hi guys, need your kind advice. 3 months ago, my computer started to give me various problems. One of it was whenever I leave my computer on for more than 15 minutes without touching the mouse/keyboard, the screen will go dark. So I'll try to turn the display back on by moving the mouse or typing on the keyboard. However, the display would still refuse to turn on. I have to hold the power button manually to restart the computer for it to work. Also, my computer would automatically restart when I play graphic intensive games like fallout 4 and battlefield. My graphics card is an r9 280x. What could be the issue here? 