Hello! I'm running an intel iMac Core 2 Duo from a few months back. I installed the most recent security update for Mac OS X Leopard and after the reboot the computer worked fine for 2 more boots. (Note: during these boots I noticed that often my computer would get the spinning rainbow wheel for a long time before it went away. It happened at apparently no prompting.) After those I installed the game City of Heroes on my macintosh and then attempted to install the new safari and Java update (I haven't updated in a while.) I was told the Java update and safari update failed to install. I rebooted to try again and attempted to install again. Both failed. I gave up and started playing CoH. About 2 hours after playing my game froze. I was running ventrillo at the same time and was able to talk on that. After many failed tries to use command + option + escape I decided to hold down the power button to reboot my computer. The first attempt yielded a solid blue screen. The second attempt the computer started fully. Stupidly I assumed the problem was fixed and didn't backup software and files. I tried to run City of Heroes again and the app would not even show up in dock. It simply would not run. All other apps seemed to work fine. I rebooted again and this time I got another blue screen. Again, but this time I got the grey screen with the apple symbol and the spinning wheel. I've never gotten past this screen again. I have boot camp so I tried to boot into windows. Windows booting was successful. After that I rebooted and attempted to use the advice from this thread for help: http://forums.macrumors.com/showthread.php?t=322670 I tried the single user mode fix first. I got the message: /dev/rdisk0s2 Root file system Checking Journaled HFS Plus volume Checking Extents Overflow file. Checking Catalog file. Incorrect block count for file temp3271201 (it should be 8 instead of 0) Keys out of order (4, 966) Rebuilding Catalog B-Tree. The volume Ben's Computer could not be repaired. FILE SYSTEM WAS MODIFIED After that I tried to reset PRAM. Still the grey apple with the spinning wheel. I tried the single user start up again. Again failed. After that I tried booting into safe mode. Using these steps: http://support.apple.com/kb/HT1455 Unfortunately, NONE of these ways would let me boot into safe mode. Both left me at the same grey apple icon and spinning grey wheel. I would appreciate help SO much. Even if the only fix is to get a new computer any advice would help me. If I need to somehow reformat or such then if anyone might know how I could backup my settings and applications with this impediment.