MacMini HDMI/vga adapter not detecting resolution

hi all,
i have a mac mini (10.9.2) and on the back i have plugged up a hdmi/vga adapter and i have plugged in the vga cable to a dell 24" monitor (1920X1200@60Mhz)
for some reason it cannot detect the display resolution, it onlys shows the max as 1600X1200
can anyone please advise me on what im doing wrong
many thanks
rob

Could be the VGA adapter. What brand/model is it?

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