Can you describe the symptoms a little more?

Someone will know way more than me but the first step should be booting the Plus with HD connected using any disk tools disks you have.

If you can port stuff from the Internet, you will probably eventually want HD SC, which I can email you (in a disk tools disk image) if that will help. And then SCSI Probe if it will run which I cannot confirm as it has not been able to run on my SE for some reason.

(http://www.macintoshgarden.org)