My Mac started off by giving me the spinning ball of death for an unreasonable amount of time so I caused a force shut down (I know, unwise) and tried to restart it. Came up with the file error. I know what it means so I tried to run disk utility to find the boot disk but their I wasn't even there. I have tried researching it for a while and tried to start it again, and this time it started up normally. So I frantically started removing valuable files, but before I could finish the it froze again. So I restarted it and was faced with the same problem. I ran disk utility, and the boot file was there! So I tried to run a disk repair and it crashed again while in the process.
I am completely stumped, ideas?