External Display Problem

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hey guys!

have 2010 mid 13" macbook pro, , thunderbolt vga adapter, used connect external vga monitor mac, years. now, updated yosemite, it's not quite want work. connect adapter, screen flashes, detects monitor, can see @ settings, can drag windows it, on monitor, says "no signal" , stays blank. ways solve it? tried different vga monitors, same result. since yosemite. :confused:
 

i'd check adapter testing different 1 , different monitor. isolate yosemite.
 


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