Today my MacBook showed up some wheel of death and I waited and waited and then after a long time (10 minutes) decide to force shutdown.
Ok, I know its not a good idea but I've done this before and then put in the installation disk and with Disk Utility I could easily repair the boot, if it's crashed. But this time Disk Utility could not find my hard drive.
I believe its not a physical issue, once started from a forced shutdown and no noises with the hard drive. But how can I repair my hard drive if even the software cannot find it?

Ps.: I have already opened my MacBook, disconnected the hard drive, and plugged it again. You know, just in case, but no effects.