Snow Leopard not booting after installation in rEFIt triple boot system

Hello,
I have a Core Duo Mac mini, on which I was successfully using a rEFIt triple boot configuration with
Leopard, Windows XP and Linux. After installing Snow Leopard on top of Leopard, Snow Leopard boots directly (without rEFIt showing up) the first time after installation. On the following reboots, rEFIt shows up but when selecting Mac OS, the system shows first the grey screen with the Apple icon, then it shows a grey screen with a "no access" icon and does not make any further progress. I reinstalled several times and at last I even removed rEFIt, but Snow Leopard won't boot anyway.
Can anybody help? Thanks

Welcome to Apple Discussions!
I'd post a bug report here:
http://sourceforge.net/tracker/?group_id=161917&atid=821764
They could probably help isolate your problem.

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