My computer has been having problems for about a month now. It seems to run slower than usual, and it keeps freezing. Sometimes it restarts itself, and sometimes I have to manually restart it. Then about 5 days ago it just shut down completely. I couldn't turn it on at all. I went online on another computer and Googled the problem, and I discovered that the systems my computer had been experiencing usually meant that the PSU needed to be replaced. So I got a brand new PSU, and my computer turned on with no problem. I thought that everything was going to be fine, but just a few hours after I had gotten my computer running again, I tried opening iTunes and my screen froze, and then the computer restarted itself. Apparently there must be something else wrong with my computer.
I don't think it's a virus, because I regularly update and run Malwarebytes and Super Anti-Spyware every couple of days or so, and they haven't been finding any major problems. So it seems like the problem must be something technical.
If anyone has any idea what may be causing these problems, any help that you can provide would be greatly appreciated. Thanks in advance.