Macbook pro 2011 early cannot find right resolution for external display and keeps flickering

I have a macbook pro 2011 early running 10.9, and a LG FLATRON W2242T external screen. Also, I have a VGA to miniport from Apple and a VGA to HDMI, plus a HDMI to miniport(from Apple). By just connect with VGA to miniport to my MBP, it just flickers few times and stops detecting. But by connect VGA to HDMI converter and HDMI to miniport to my MBP, it keeps flickering, a non-stop flickering. The external screen always shows no signal. However, if I connect my MBP to my TV through HDMI to miniport, it works fine. But connecting the VGA port to my TV, it gets the same problem. I have tried clear my PRAM many times, and it gets the same result. Does anyone have the same problem? Thanks

Macbook Pro 15" Early 2011 external display won't work as it used while Snow Leopard, I hate you Lion so far. I cannot even Go Back!
Did you bother to backup or clone your SL installation before dumping it?

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Macbook pro 2011 early cannot find right resolution for external display and keeps flickering

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