The hard drive failed. Two weeks ago when I got the first error message I made a thumbdrive backup. Then all would be fine, I kept backing up to my seagate external drive that connects to web etc. Every time I'd get the failing messages I'd try to save image backup to the seagate drive but kept thinking that the seagate drive was the problem and would restart and be fine. So, all is not fine.
I tried to buy new drive at best buy but those geeks sold me a drive that wasn't thin enough, my friend who knows abt installing hard drives screwed it in and said I could tape up the back. (um, no!) Before I took it back I tried plugging in the thumb drive to see what would happen and it still said no bootable device. Same exact error message. Now I'm trying to decide what to buy on amazon and there's so many options and I'm kind of freaking out. I can buy and screw something into place but then what? I'd be better at installing windows on a dollhouse 
I don't even know if I have a recovery disc or any other disc that came with it. Am I supposed to download something and burn a disc on a working computer?