Yesterday while browsing the internet, my MacBook crashed. It was dark and then a white screen appeared saying there had been a problem and it was restarting. It did this repeatedly as I tried to return to browsing. I tried to shutdown and restart, no help. I reset the PRAM, no help. I have repaired disk permissions, no help. Now, the wifi, bluetooth, and battery icons are missing form the upper right hand corner. I went in to System Preferences and clicked on Network, it will open the window and then quickly close again and return to the System Preferences. I tried to sign in as a guest, it is the same as my account. Any ideas?