What it does is make OS X think a monitor is still plugged into the display so whatever settings you have configured for that "monitor" will be sent to the VNC viewer. It's clean, it's easy, and it works out the box. The easiest thing I have seen that solves this problem is getting a Dummy Display Emulator. If you leave the monitor attached, VNC will work with no problems across reboots Trick OS X into Thinking a Display is Still Attached This is why you have to hook up a monitor to get screen sharing to work again. This is why I am not a fan of VNC or ARD and will only use it if I absolutely have to (95% of everything I do on headless systems is in Terminal, so this doesn't come up very often for me) If nothing is connected, no parameters are sent and thus the viewer has no idea what to display. The way it works is that it queries the display server to get the settings so VNC can send those settings to the viewer. VNC is tricky to use on a headless system. One client I like on iOS and Mac OS X is Of course Apple's free Screen Sharing app (look for it in /System/Library/CoreServices/Applications ) and Apple Remote Desktop work well, too.
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