Update: Put barebones System Folder I extracted from 7.6.1 CD-ROM which I then put on a boot disk CD-ROM, booted from disk, copied System Folder to HardDisk with the System Enabler with the stock Motherboard in the computer. Shut computer down booted with Mac OS 7.6.1 CD-ROM with stock motherboard still in the computer, launch installer out of memory dialog comes up, uncheck all the extras, still get out of memory. Boot off Mac OS 8.1 CD with stock motherboard and system folder with and without enabler on the harddrive. Mac OS 8 CD says, not compatible with this Macintosh.

Shut computer down again with the system folder and system enabler from the bootdisk installed on the hard drive. Took stock motherboard out, put LC 575 motherboard in, computer boots with bus error. Put Mac OS 7.6.1 CD ROM in with 575 motherboard still get bus error, Mac OS 8.1(Full) same thing, bus error.

Only success I had was making a 7.6.1 boot disk and booting from it and putting the barebones system folder on the hard drive with the stock motherboard. Nothing else is working.

I don't know what else to do. I was using System Enabler 1.0.