Okay, I've glued the power button back in place and it's working again. For now anyway, though if it snaps off again I at least know how to fix it. Now back to trees and figuring out how to texture them in Blender. Bleah.

If you want a good Blender manual, by the way, I suggest trying Essential Blender, which I'm really happy with so far. You can buy it, or you can download the (older?) text files at that link, along with the images (though you need to download the images separately). It's full of clear and well written descriptions of what does what, and -- unlike Blender: Newb to Pro -- it's not a mess and doesn't just teach by having you do things and explaining what they are along the way. Each of the chapters covers a different topic (like lighting or objects), can be read on its own, and consists of both a tutorial and a plain explanation of the topic. Pulling up the image files manually whenever they're mentioned in the text is a bit of a pain, but it's worth in, in my opinion.