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If the latter is the case, you may need to take steps to provide extra ventilation or cool the air flowing around or through your computer. This can be due to malware, which I’ll discuss in a moment, or it can be due to running a CPU-intensive program or game continuously for a long time. Most often this is because the CPU is being used too heavily for too long. Occasionally, a poorly designed computer can overheat even if there are no obstructions. Make certain the ventilation holes aren’t blocked by dust or other debris. Your computer needs good ventilation to avoid overheating. Most often, a suddenly black screen accompanied by what appears to be a completely unresponsive computer is a symptom your computer has crashed.Īnd the most common cause of crashes is overheating. And, of course, it could be expected behavior in the form of a screen saver or standby or hibernate modes. It’s possible that only the monitor or display portion of your computer is having a problem, so trying another (possibly external) monitor is a quick way to diagnose. Malware is a possibility as well, though not as common. Most commonly, black screens indicate that the computer has crashed, perhaps because of overheating or other hardware-related failures.