I have identical  setup (Mac Mini + Hardy) and have similar problems.
I must add:
1) In my case screen becomes gray (not black) and becomes black only if I 
switch to textual console and back. After that X is still working but driver 
doesn't redraw the buffer. I've tested with X11VNC and X session is fully 
operable via VNC. That happens randomly but at least once in 1-2 hours.
2) In addition, screen blinks randomly every few seconds. It looks like some 
parts windows in background jumps to foreground and then foreground windows 
redraw it self. It is also possible that Video controller jumps to wrong part 
of frame buffer.
3) I have to reboot to use X serer again via Video controller. Removing driver 
(intel, i was not able to remove intel_agp, it's locked) from kernel doesn't 
help.
I am willing to assist, please request any information and tests you may need 
to perform.

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lockup on mac mini 945GM [8086:27a2]
https://bugs.launchpad.net/bugs/218334
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