Help connecting to external LCD...

I connected my mini dvi to vga to the lcd sharp 1080p. And it says
signal not compatible? Anyone else getting issues? What am I doing wrong?

I connected my MacBook Air to a Pioneer 50" HDTV with no problems using the microDVI --> DVI "dongle" supplied with the MacBook Air and purchasing an additional cable (8' Monster Cable DVI to HDMI)...
HOWEVER - I then found out there is no audio signal to the TV since DVI does not carry audio. I am assuming you must connect from the minijack on the MacBook Air to Male RCA cables on your HDTV/projector.
Problem is....not all minijacks fit the very small confines of the audio cutout on the Macbook Air.
does anyone know of a specific cable that works [has personally tested and tried]...about 8ft in length?? I was looking at this cable..but don't want to buy just yet for fear the minijack connection might be too large for the MacBook Air side of the connection.
http://www.antonline.com/pMBL%20MCON-2M-GP220961.htm

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