I have this weird flashing question mark folder on startup I used my computer earlier at school, and it was working perfectly (I have a 2010 MacBook pro). I've had lion on it for a month. When I used it at school it worked perfectly. I took my notes on it, then after class, I put it to sleep. I get home, open the lid, and it came up with that error message of when you unplug a USB without hitting eject first, which was weird because nothing was plugged in at all. Then I tried to connect to my wireless. It showed up, I clicked on it, nothing happens. I go into system preferences and click on network, and it said system preferences need to restart to work, I quit and restart, same problem. Battery charger is plugged in, light on charger is on, but computer doesn't show it's charging. I restart the computer, now all I get is this weird flashing question mark folder. If someone can please try to help me solve this so I don't have to go make the trip to the apple store, that'd be great