Recently had to reinstall the OSX on my MacBook with an installation disk as my computer wasn't booting up pass the Apple logo. After re-installing the OSX and recovering my data with TimeMachine I had to update my OSX which required me to restart and after that everytime I tried to login it would go to a blue screen and return to the login menu. I can't even use guest to login. Any ideas on how to fix this? Note: I've already tried the repair disk/repair permissions and it keeps saying the hardrive looks okay and keeps "fixing" the same permissions over and over again. I've also tried logging in with safe mode and the same thing happens.