Please advise....I have a 1TB Western Digital hard drive connected to a 24" 3.0GHz iMac via the Firewire 400 port. Frequently, the iMac will not wake up from being asleep unless the Firewire cable to the hard drive is disconnected. The hard drive is being used for Time Machine. Also, the iMac won't boot up after a restart unless the firewire is disconnected. I've had the iMac for over 6 months and finally started looking around for a solution. Thanks in advance!