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No screen displayed when booting with options key held down

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When I hold the option key down to select which OS I want to boot into I am getting nothing displayed on the screen but the booting has paused waiting for my input because I can use the cursor keys and return to get the system to boot.
Anyone got any ideas as to why I cant see the choices?
Thanks
Gary

Answers

Just a quick follow up on this problem. I have just tried the Mac Mini on my TV using the HDMI port and I get the boot menu displayed when holding down the Option Key and it works fine. The issues are arising when I plug a VGA adaptor into the mini display port and use that with my monitor. The monitor is not reporting any out of range or sync signals while booting and I have tried 3 different monitors of various ages and all have the same result.
I also get no apple logo or any display while OSX is loading when I use the monitor
Gary

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