Just started having some problems with my current-gen MBP (2.53GHZ, 4GB RAM, 250GB HD). Earlier today, I tried to move a file to a new location and was met with "error code -36" stating that I couldn't write the file. Immediately made sure that I had permissions set to read & write and tried again. No success. Shortly after, I ran Software Update and tried to install a few updates that popped up. After starting the download, Software Update immediately quit, stating that there was a problem with my network connection and that I should check it out. Did that, and everything was running as usual. I decided to reboot my computer, and upon doing so, I was met with a normal grey startup screen with a progress bar beneath the spinning wheel. After the progress bar was complete, my computer was stuck on the startup screen with the spinning wheel for almost an hour. I shut it down and booted up from my Snow Leopard disc. After verifying the disc, Disk Utility told me that it needed to be repaired. Obviously I did so, and then restarted using my MBP's internal HD as the startup disc. Still no luck. The progress bar is gone, but my computer seems eternally stuck at the grey screen with the spinning wheel. Any advice?