I heard a rumor that it is bad to shut down your computer all the time (when I go to bed at night). Is it true that it is better to just have your computer in sleep mode and that it is bad to constantly be shutting down your machine? Also, I have to restart my computer alot lately because it just gives me a blank screen lately when I start it up. I am forced to hold the power button to turn it off, then turn it back on. Does this hurt the computer at all? Should I return it? The other day I had to do this six times until it finally started up.