Mini to VGA for Projector


i'm using mini vga adaptor projector @ work , not push video. i've tried several resolutions , refresh rates not change. other people using laptop built in vga don't seem have issues getting on projector cant seem make work. work when plug vga monitor i'm pretty sure adaptor ok. did apple mini vga firmware update date.
 

can connect mini monitor (to test cables etc)?

try different refresh rate.
 


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