Shared Screen Has Gone Black

I no longer have a seperate monitor for my mini (which I use for running pre-no powermac OS10 apps). For about a year I've just used my iMac and share screen from the Mini. Works beautifully till yesterday. The mini screen now comes up black. I can still connect with the Mini, access the finder, files and so forth but I can no longer see the screen. I've had problems sharing screens from the iMac to my Powerbook (one of the reasons I have iMac and Powerbook), in fact I've given up on that one, I simply can't get the Powerbook screen up on the iMac although the reverse is quite possible and works every time (so far). The Mini screen comes up black on any computer I attempt to share its screen on, Powerbooks and 2 different iMacs. Incredibly frustrating.

I had the same problem after upgrading to ML 10.8.x
Whenever I connected to my Mac mini using Screen Sharing, I had the black screen redraw issue.
After many trial an error, I discovered it was related to fact I was using my Mac mini headless.
It seems the GPU video driver isn't loaded when there is no monitor connected and turned on.
It this case, the screen redraw is probably slower and needing more shared memory.
I found those solutions:
http://blog.macminicolo.net/post/33839671756/build-a-dummy-dongle-for-a-headless -mac-mini
http://www.geeks3d.com/20091230/vga-hack-how-to-make-a-vga-dummy-plug/
It solved the problem for me. Still I would prefer a software solution to force the use of the GPU.
Claude

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