Mac mini 2014 detect lcd monitor problem

Hi.
about 2 weeks ago, I bought new mac mini 2014 and dp - vga connector.
I have mitsubishi rdt179s lcd monitor.(17') , d-sub port + dvi-d port.
I must to use d-sub port.
when I open display menu, my monitor spec is different.
only " display 13.9 800x600 ".
how can I fix this? to 17' and 1280x1024...
ty for read...

Try installing and using one of these apps
SwitchResX – The Most Versatile Tool For Controlling Screen Resolutions On Your Mac
Display Menu from Mac App Store

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