Macbook Pro cannot connect to digital display.

Today when i plugged in my Macbook Pro 13" (early 2011) there was no output. The monitor was in power save, and my compute did not detect the monitor (note i have been using this setup for months without problem). Every time i plug in the dvi cable ( to my mini display port adapter i get the ususal blue flash but then nothing else happens.
I've tried a new dvi cable, tried a different monitor on my mac.
then i tried both monitors on a windows computer, and they both work,
then i tried using VGA out  on the macbook (using another adapter) and that surprisingly worked.
Only thing left either the computer (hardware or configuration?) , or the DVI - mini DP adapter. They cost $30 and  I really don't want to spend that kind of money on it unless i know that is th cause.
is it possible for my mac to have  VGA out but DVI/HDMI are broken. or is it just my adapter?

igotsnomoney wrote:
is it possible for my mac to have  VGA out but DVI/HDMI are broken. or is it just my adapter?
VGA is analog and the others are digital interfaces so maybe there is something wrong with the video card.
See if smc and pram reset has any affect.
Only thing left either the computer (hardware or configuration?) , or the DVI - mini DP adapter. They cost $30 and  I really don't want to spend that kind of money on it unless i know that is th cause.
Actually you can get one for $6.65 from monoprice.com.
Mini DisplayPort | Thunderbolt to DVI Adapter

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