I just now tried to put both Disk Copy and the disk images on the Centris. Neither worked. And when I opened Stuffit, and clicked Expand in the file menu, the disk images didn't show up. Maybe I used the wrong type of CD?...

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Did the CD show up on the Centris desktop at all?

Can you open the CD from the desktop and see the files?

If you burnt a PC formatted CD, you will need some extensions in the System folder on the Centris to see the disk and its contents. I forget exactly what they are, but some of them will be CD extension and PC exchange, Mac OS Easy Open, ISO 9660 extension, Joliet extension.

What OS are you running on the Centris? Someone more familiar with it should be able to give you the full list. Otherwise go to macwindows.com and look for the appropriate guide article to reading a PC disk/CD on a Mac.

Even with those files, I think you need to make sure your PC burning software makes an ISO 9660 or Joliet disk.

Okay, so let me go over this one more time; correct me if I'm wrong:[1 -5 : all good]

6) The moment I turn the power on, insert Disk 1.

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If there's no OS on the SE at all, any time after you power on is OK.

If there is an OS on the HD, put the floppy in while it's running, choose the floppy in startup disk, and shut down or restart.

Or yes, immediately after power on.