1st generation iMac G5 won't start up with LaCie connected

Sorry if this has been asked a zillion times, but I am trying to help a friend (as you can see it is not my iMac):
She has a 1st generation iMac G5, and a LaCie external harddisk connected by firewire. The LaCie has an independent power supply, i.e. not powered by firewire.
Her iMac starts up fine when the LaCie is NOT connected, but refuses to do so when it is. This problem did not always exist.
Does anyone have the answer - better still a cure?!

Is the LaCie on and showing on the desktop when she shuts down? It's always a good idea to eject FW drives before shutting down, and to start up with them unplugged, otherwise data corruption can occur.
Miriam

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