All a success!

This is very educational; I am now getting to know the interior of an SE well.

I figured out how to remove the logic board (you were right, MultiFinder, the metal tabs aren't so bad once you get the hang of them). The screw wasn't there, so I removed the floppy drive as well (which is only possible once the logic board is removed) and after shaking it around a bit, out fell the screw!

So, that having been addressed, I put everything back in, plugged it all in, (except the hard drive, of course) and put the case back on. Tomorrow I'll turn it on again to make sure that I haven't damaged anything while I had it open. I don't think I damaged anything, but you never know till you turn it on...

I had a question, though--like I said, the internal HD is completely trashed, so if I manage to destroy it with a speck of dust, then I haven't lost anything. But I did have a question--assuming I do get a speck of dust on the HD platter without my knowing it, and assuming I put it back in the Mac and turned it on, a) would it actually damage the computer, or just the hard drive itself, and B) if I blew air on the platter and removed that speck of dust, would everything function normally (assuming the dust was the problem)?

Thanks for helping me, everyone (or in this case, MultiFinder17).

And remember--the more I learn about these Macs, the less I'll need to annoy you with constant questions!

-Apostrophe