strange problem with mac cube

[dave@ada2.unipv.it]

Hi,
	after having installed debian (without dual boot with OS X), my mac cube has a strange behaviour:
every time I issue a shutdown  the machine halts effectively for a few seconds but then restarts giving
me the prompt of yaboot... the only way I have to make a "real" shutdown is to interrupt phisically the 
power for a while :(

Any hints?

Thanks in advance,
	Davide


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