Apologies if this particular problem has been answered on another post already. I tried searching the forums but couldn't find anything relevant. Ok, so i've been running leopard on my 17" MBP (2.16 Ghz) for almost a year now and i've had no problems until yesterday.....when my MBP decided that life simply wasn't worth it anymore and died on me So i wept a single tear and starting searching for my installation disc. (Thankfully i DO back up my important data ) Re-installing has proved to be more difficult than expected though. I ran Disk Utility first to verify the hard drive and it came up with a message saying "invalid node structure". The repair function also failed to yield any results. Next, i ran a zero-out erase and verified the hard drive again. "The volume Untitled appears to be OK" (Win win win!!!) However, when i tried to install the OS, it got about halfway through the installation and stopped, telling me the installation failed. "Failed to mount to /Volumes/Untitled" So i turned it off and restarted the installation process. It got about halfway again, and stopped doing anything. I powered down once more and tried once more. This time it was successfully installed, but when it restarted, it got to the grey screen where the apple logo, prohibited sign, and ? folder cycle randomly. What should i do?????