Inspiron N5030 RAM upgrade issue. 4 beep error.

I am upgrading my 4 GB (2 x 2GB) ram at present to 6 GB replacing one of the 2 GB one by Kingston made for dell 4 GB memory. I tried all possible combination but it keeps on giving the 4 beep error code on startup and the screen is completely black.

I also got the ram replaced for it might be faulty but no luck.

Any help would be appreciated. Thanks a lot.