Hello everyone. I am having a problem with my relatively new MacBook pro 17' intel i7. When I start up the computer, a loading bar appears under the apple logo. When the bar is complete I get to the screen where I enter my password. After inputting my password, a white/grey screen flashes momentarily and I am taken back to the password input screen. Restarting has no effect and neither does clearing the PRAM. I tried to start in safe mode by holding the shift key at startup but the loading bar problem still occurred. Please help! It should be noted that I used bootcamp to partition my hard drive and install windows 7 and that operating system seems to be starting up just fine. Thanks again for any help. Some additional information: 1. I am currently running Lion. 2. Problems started occuring after an update to my Windows 7 OS. 3. Every time I try to restart after my password/blank screen loop, the screen goes white and I have to force shut down. It may just be me being impatient but I seems to get stuck on that white screen when i try to restart.