Just a guess, but try a bootable floppy in there, cause it *might* be finding a corrupt system folder, which it *might* try to boot, possibly stopping booting, and just hanging there.

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Had the notion that that might be a problem, so I checked that the floppy drive doesn't have any disks in it. And also I removed the hard disk just to be doubly sure.

I managed to boot using the command-Option-X-O combination when turning it on (thanks for the tip MultiFinder17). But I wasn't able to do so after I re-installed the hard disk. From the looks of it, it seems that the hard disk might be the culprit, since I hear it running, but I don't think that it's actually functioning correctly. I'll have to find a boot disk for the Classic and try to boot from it (first get a floppy drive for my MacBook to write the disk) to rule out any other components.