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When you turn your computer on, it runs a self-diaganostic to make sure everything is working properly. This is called the Power On Self Test, also known as POST. When POST detects an error, it emits a series of beeps. These are called beep codes. Your 4 beeps is a beep code because something is wrong with your computer. If you still have your motherboard manual, look under beep codes and look for 4 beeps, and it will tell you what is wrong. If you don't have your manual anymore, you have to search on Google for beep codes for your specific motherboard. Every computer has a different set of beep codes, so you have to find your specific ones to find out what is wrong. -Jesse

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