RAM PC the cpu beeps 3 times

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Hello,

I had 1+1=2gb ram
So i bought a new 4gb ram but whenever I place it on motherboard and start the PC the cpu beeps 3 times and the monitor won't display anything.i cleaned it so many times and also tried to place it on another pc,it works well.
But whenever I place 1+1=2gb ram on motherboard it works.
Please Help.
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Monday February 1, 2010
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November 22, 2018
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Thank you
Hi

What is the make and model of your machine ?

What is your operating system ?

What type of new RAM are you trying to add, DDR, DDR2 or DDR3?
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