Mavericks, change resolution of headless Mac Mini

After updating to Mavericks I have have problems at changing the resolution of my headless Mac mini. After changing the display resolution my VNC/Screen Sharing sessions kept blacking out and I couldn't see anything. Any solution?
Thanks, Andrea

Try following the tip listed here http://hints.macworld.com/article.php?story=20131025050251648
However note that headless Macs offer far slower screensharing performance compared to ones with a display attached. This is because when headless the video card is not being used.
Apart from the old trick of making a dummy VGA adaptor with resisters to trick the Mac in to thinking a monitor is attached, other options would be to use a Gefen DVI Detective or HDMI Detective, or to connect the Mac to a KVM (Keyboard Video Mouse) switch box.

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