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For the third time since a few days ago, my laptop just randomly shut down. Thankfully I wasn't working in any of those three times, but anything that I had open and didn't save was lost. All three of these shut-downs happened without a single warning and not even the usual windows screen saying "shutting down" appeared. The screen just went from completely normal to black in a second, and when i pressed the button to turn it back on it turned on just like a normal turn-on after a normal shut down. Please help me figure out what this is (causes, consequences) and especially how to fix it. I am starting to think that it really could be caused by a virus, but I ran tests with McAfee and none were detected. I also thought it could be because of overheating, but the laptop has already been much hotter than it was in these sudden shut-downs, and nothing at all happened then. I've had this pc for slightly more than 2 years and really can't afford a replacement. Please help me with this issue. Thanks.