MacBook Pro flashing question mark but I can't repair because hard disk not found in disk utility 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.
I'd say this is almost certainly a hardware issue. Likely something internal to the drive (if it sounds like it spins up normally, probably some part of the onboard electronics), the hard drive cable or the SATA controller on the logic board.

I'd advise taking it in to an Apple store if you can (especially if it's under warranty), but if you want to try it yourself, the first thing to do is try a different drive, and see if that gets recognized. If it does, your drive is dead, if not, it's a problem with the logic board or the cable. You can get replacement parts from iFixit, but if it's the logic board, then you're better off getting a quote from Apple for a replacement.