2 questions: iMac after power failure & Lacie firewire drive keeps spooling

OK, my power blinked the other day and my iMac was off, but to get it to power back up, I had to take power completely away from it for a few seconds before it would respond to the power button at all.
Next, my Lacie external drive keeps spooling for a split second and stops for no reason. As far as I can tell, no programs should be accessing it. It does this about every 10 to 15 seconds. I can still access it when I want and it seems to be working fine, but I know the continuos spooling and stopping cannot be good for it. Any help you guys can give would be appreciated.

Hi John
You don't say or show in your profile, but for the Intel iMac's first reset the SMC (System Management Controller) exactly following all the instructions in the link below.
http://docs.info.apple.com/article.html?artnum=303446-en
Dennis

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