i have a few questions on computers. my first one is about leaving it on. im on the computer through out the day. ill get on to check maast or e-mails or "other" stuff and i was just wondering if its best to just leave it on until the last time i use it or turn it on and off after every use. i was told from a friend that turning it on and off through out the day is bad for the pc cause it gives the mother board a little shock and if it shocks the pc more then 3 or 4 times a day can stress the pc out. also, how bad is dust? i have an extermely dusty apartment and im always wiping off the top so i can only assume that the inside of the moniter, tower, and keyboard must be real dusty. any suggestions, comments or answers?