Hello, i got a prebuilt PC two years ago and sometimes it randomly shuts down. When it shuts down, most of the times i just boot it up and the same thing happens. But sometimes it doesn't boot up and PSU fan starts blowing with heavy sound and i hear 4 continous beeps. But, when i open the case and i remove the RAM and install it again, it works. Could it be the PSU or is it something else.