Hello! Yesterday there was a power outage in the morning that lasted for a couple of minutes. When it happened my PC was shut down so I don't think there was any damage done to it. Later in the day I booted up my PC and it opened the BIOS menu. I didn't change anything, just pressed "Default settings & exit" and then my PC worked normally for a couple of hours. When I tried to shut it down, after the power button on the case turned off, the PC stayed offline for 2 seconds and then turned itself back on. It did this multiple times so I Googled a fix, but I was unsuccesful. Because I had to go somewhere I thought it would be a good idea to press the power switch on the PSU in order to keep it off. Then, when I returned a couple of hours later, I pressed the switch again and tried to boot it, but nothing happened. I tried plugging out every peripheral, taking out the power cord, leaving it disconnected for hours but it still doesn't work. The computer receives some power as I can see two lights in the internet port in the back of the case. I have to mention that something similar has happened multiple times, most recently 2-3 weeks ago, but I don't remember what I did to make it boot up again, other than plugging the unit in and out.