3 beeps sound in specific ram

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Hello,
I have 4 ram slot and 2 ram stick of 2 GB.All slots are working properly.....
Some months after 2 ram slot give no response when rams put on them....
third slot give 3 beeps and don't boot up when a working ram insert into this.....

..
There is only a slot that work with these ram properly ...
Some Solution I done that are available in internet about 3 beeps but nothing happens....




System Configuration: Windows / Chrome 77.0.3865.90
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