IMac won't restart after crash

Hi all,
While surfing the Web with Safari, the system crashed, that is the display was blocked, it was possible to move the cursor with the mouse but nothing else, <option><Command><esc> was inactive as well, so I restarted the computer with the power button.
Then I got a very funny screen, with a kind of "Vichy" pattern, that is full of small pink squares. I could see the apple logo with the turning wheel for while, then nothing, no reaction to the mouse or the keyboard (I plugged a USB KB).
I restarted the imac several times, with the same result each time.
Eventually, I launched the full Apple Hardware Test utility. After a 45 minutes, the test did not detect any HW problem.
I restarted then the mac again, and everything was fine again.
So the basic problem is solved but I don't have any idea of what can have been wrong and why it's OK again.
In the system log I only have that that seems suspicious:
+Aug 28 14:29:44 imac-g5-de-david kernel[0]: 0x96e0a9fe+
+Aug 28 14:29:44 imac-g5-de-david kernel[0]: ** ASIC Hang Log End **+
+Aug 28 14:29:45 imac-g5-de-david kernel[0]: ATIRadeon9700::waitfor_rbspace: Overflowed block waiting for FIFO space. Have 2, need 5. RBBM_STATUS 0x80036100+
+Aug 28 15:25:03 localhost kernel[0]: standard timeslicing quantum is 10000 us+
Does it ring a bell to somebody? Is there something I should check to understand what happened?
I feel I have had several crashes while surfing the web since the last OS update...
Thanks for your help!
David

Unfortunately I don't have yet another Mac (though this can be the chance!)
i found another way: when I boot on the install disc, I can open a terminal and I have then access to my 'Macintosh HDD, with all its data (basically the 'Users' folder, and I have access as well to external HDD (as long as they are formatted OSX apparently, those formatted for windows cannot be mounted by the disk utility).
I tried a basic "CP -R adirectory_inUsers destin_firewireHDD" and it seems to work. As soon as I get a new external HDD I'll try to copy all my data in this way.
Thanks a lot for your help.
David

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