|Suddenly my PC started turning off unexpectedly, not at a certain time or anything but seemed like it was more likely to happen when I was doing something taxing (playing a game). I tried to do somethings like looking for viruses or spyware but it seemed more likely to be a hardware problem. I set it so that a blue screen should come instead of just restarting but it never happened.|
I tried booting a memtest of a USB stick but it seem my system wasn't able (or maybe I didn't understand how.
One time I turned it on and left it running to see how long it would last. When I came back several hour later the screen was showing black/white lines (not straight ones) running on the screen.
When I tried restarting the fan just spins up a few times until it starts properly (as it seems) but nothing appears on the screen. Now it only spins again and again without starting up.
I was already thinking about upgrading with a new mobo, cpu, gpu and memory but I'm a little afraid that this could be the power unit.
Any idea what is wrong, what I could do to see if the power unit is still good before buying new stuff?