Thanks Phreakout!

I tried booting the SE/30 from a floppy while holding down the shift key, but that didn't do the trick.

While I'm waiting for your OS disks, is there any method I can use to copy a complete Apple OS to a set of floppies using my Windows PC? The complete System 7.5.3 is posted on lowendmac.com as part.bin files, which I saw you mentioned in a previous post. Can I somehow get this onto floppies with the Windows PC?