Mini DVI to DVI adapter not working for MacBook BlackRAM upgrade for MacBook black (Early / Mid 2008 model - MB404LL/A)

Hello.
I have recently purchased an external display monitor (LG D2342P LED) and I am trying to connect my MacBook black - MB404LL/A (Mac OS X 10.6.8, Core2Duo 2.4 GHz) to the LG LED monitor using mini DVI to DVI adapter. The dispay is getting detected by the macbook in the display preferences but the screen shows "No video input" ( as a blank-black that bahaves as no input coming to the Monitor).
Please help, what should I do to connect to the monitor ? Is there any setting that I am missing that needs to be preconfigured or is this an issue with software update of 10.6.8 ?
Thanks in advance.

Thanks for the reply, shldr2thewheel. I ll go ahead with the RAM specification you have mentioned.
Can you please suggest about the Hard Drive, what should be the specification I should be looking for compatibility of my MacBook black ?

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Here is an Apple article on the subject of having no video on an external monitor. It's written about the Mac mini, but it applies equally to any other Mac.
http://docs.info.apple.com/article.html?artnum=301345
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Thanks for the technical information. That was very helpful. I took the adapter to my local Apple Store (even tho I didn 't buy it there) and asked them to test it, but they couldn't get to for a couple of hours. But, they gladly gave me a new one to try at no charge.
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BUMP
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Mini DVI to DVI adapter not working for MacBook BlackRAM upgrade for MacBook black (Early / Mid 2008 model - MB404LL/A)

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