Trying to use Disk Utility on my iMac --

I have had some extreme slowness on my iMac, particularly with Mail (launching and retrieving emails takes forever) so I am trying to use Disk Utility to see if I can locate and fix the problem. I'm trying to use the version of DU that's on my MacBook Pro and am connecting it to my iMac via firewire 800 to do this. I restarted my iMac with the "T" key held down to make it into a target disk and it comes up on my MacBook Pro desktop. The trouble arises when I try to use Disk Utility from the laptop to verify and repair the iMac disk -- Disk Utliity in my MacBook Pro gives me an error that reads "The disk "iMac" could not be unmounted."
I have all peripherals unplugged from the iMac and have only the firewire 800 cable plugged into it. Any idea what I'm going wrong?
Thanks in advance.
Message was edited by: DVDon3

DVDon3 wrote:
I have had some extreme slowness on my iMac, particularly with Mail (launching and retrieving emails takes forever) so I am trying to use Disk Utility to see if I can locate and fix the problem. I'm trying to use the version of DU that's on my MacBook Pro and am connecting it to my iMac via firewire 800 to do this. I restarted my iMac with the "T" key held down to make it into a target disk and it comes up on my MacBook Pro desktop. The trouble arises when I try to use Disk Utility from the laptop to verify and repair the iMac disk -- Disk Utliity in my MacBook Pro gives me an error that reads "The disk "iMac" could not be unmounted."
I have all peripherals unplugged from the iMac and have only the firewire 800 cable plugged into it. Any idea what I'm going wrong?
try starting up your iMac with the install disk that came with it and launch DU from the install disk.

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