Okay. This has been a major learning experience. And it's not over yet. Long story short: I've got a core2 duo 24" aluminum iMac, running OS 10.5.8, with Win7 Ultimate installed in BootCamp. Near as I can tell, an NVIDIA driver blue-screened my Win7 install. I couldn't use the option key to choose a startup volume, but was able to try booting Win7 in VMWare. It would get partway through startup, and blue-screen, then go into a repair tool so fast I couldn't see what the details were. In using the repair tool, I could see the last successful startup date, and the last system change: an NVIDIA driver. About that same time my so-not-super SuperDrive started eating DVD's. (Wouldn't or couldn't eject, and scratched into oblivion the last disc I put in.) I also began having startup issues with my iMac, too--at this point I was only able to boot in Safe Mode. (Another clue to a driver problem, but hindsight is 20/20 . . .) I had read a ton of posts here and elsewhere (before learning the details above), and repaired permissions and cleaned everything I could in that one app (whose name escapes me--the logo for Leopard version is a black X in a blue circle), and started trying the various startup keys. Thankfully I have a full Backblaze backup. When I reset the PRAM, the machine quit booting up at all. The only thing it responds to is the key combo for resetting the PRAM, and won't do a thing otherwise. (I've left it sitting for more than two hours to no avail.) I've tried booting from a USB drive, an external DVD drive (which my husband uses with his MacBook Air), booting with all usb devices unplugged, and all the startup key combos posted here and elsewhere, etc., all to no avail. Sooooo . . . am I stuck taking it somewhere, or is there something else I should try? (There's a local gal, but she charges $65/hour, which doesn't make her real attractive. There's an Apple Store just over an hour from here, but I'm not so sure I want to turn it over to them, either. I'm even up for replacing things, since it seems to be a better use of funds than an hourly repair charge.) Would talking to Apple on the phone give me any better idea of what's wrong?