So I've started having fan errors a while ago, but I dusted my fan and they stopped... for about a week and then returned at about a 50% rate of startups. A week on from that and I've been having freezes when playing games. The display freezes (and sometimes goes to black) but the computer stays on. When I restart it the first one or two times, the display fails to turn on but the computer turns on just fine. So my question is, is this my power source? And if so, how can I tell? Any suggestions would great thanks!