CPU beeps 3 times and no display

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My CPU suddenly starts beep 3 times,I checked my RAM also slots but it still beeps.My RAM are working on others computers what to do ? Is my motherboard is corrupted?

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Lets try this: Take out all of the RAM, and see if the beeping changes. If it changes, then you must find the one RAM that is corrupted, by inserting one at a time. You should get different beeps when no RAM is installed. you can also pull the harddrive and see if you get a different beep. If you do, then your MB is probably POSTing.