unexpected error

fuh...thank god nothing happen to it.Fyi,yesterday when I was trying to install a pc game to my laptop,my dvd-drive couldn't read it.Oh boy, I started to panic.I restarted my laptop many times and it was still the same condition.I asked my friend and nothing happen.I left it overnight and just now I asked my other friend and now it is good as new.Thanks a lot!This incident REALLY taught me to appreciate what I already have and never be GrEedY.