My laptop has been freezing up on me lately. If I'm in the middle of doing something, it just won't work anymore. I can't move the mouse; try to presst Crtl+Alt+Del, but still no response. I have to turn off by holding down the power button. Then when I try to power it back up, it freezes again, screen stays black; I have to try at least 10 times before I get the welcome screen. What can be wrong with it? I've had it for about 3 years.
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