Mac book pro 13" 2010 beeps every 5 seconds at start up, will not boot up.

my mac book pro 13" 2010 beeps every 5 seconds at start up, will not boot up. Any ideas what is wrong?  Removed and re installed memory, that did not work.         
Thank You   ecbrum

If you're handy with tools, pop the bottom pan on the Mac, take out the RAM sticks, thoroughly clean the contacts on both the sticks and the Mac (blow clean with a compressed air duster on the Mac, use isopropyl alcohol on the contacts on the RAM sticks), reseat and reinstall the sticks and retry. If same, try swapping the RAM sticks. If you need pictorial assistance, see here: http://www.ifixit.com/Guide/Installing+MacBook+Pro+13-Inch+Unibody+Mid+2010+RAM/ 4319/1

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