THANK YOU kylegeek! This has been driving me nuts for two weeks now, and only by a fluke of random start-up key combos was I able to get my computer to boot. I got so desperate I wouldn't shut down and only put the computer to sleep during my off-hours.

Imagine stumbling across this 'hint,' which I would classify as a lifesaver. I honestly thought my primary HD had s*&% the bed. Had never seen the Intl. symbol for no on startup, and using single-user mode (command+s during startup) said it couldn't find the 'root device.'

I followed your instructions and now it's starting up as my dependable Mac has always done. Norton should be ashamed for releasing such under-baked software. I don't blame Comcast as I'm surprised that they even deemed us Mac users worthy of an Internet security suite. Previously we only got a "sorry," which wasn't very Comcastic.

Interestingly, at least to me, my problems didn't begin until AFTER I removed the software (using the supplied uninstaller that came with Norton Internet Security (NIS)). Didn't put two and two together until I read your post. The terminal command executable, in which you provided a link, was not included with NIS, which would have saved me, and probably countless others bringing their computers into the Apple store, a boatload of time.

So thank you from a user who very much appreciates your taking the time to share your experience, and better yet, a solution. :)

Hey, Its no problem! I think i learn a lesson that day. ;) The thing was that Leopard (10.5) would boot fine, but Snow Leopard wouldn't. All the credit should go to the users in the Apple Support Forums.